1201012210021 has 4 divisors (see below), whose sum is σ = 1293397764652. Its totient is φ = 1108626655392.

The previous prime is 1201012210009. The next prime is 1201012210033. The reversal of 1201012210021 is 1200122101021.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1201012210009) and next prime (1201012210033).

It can be written as a sum of positive squares in 2 ways, for example, as 665611222500 + 535400987521 = 815850^2 + 731711^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201012210021 - 2¹¹ = 1201012207973 is a prime.

It is a super-2 number, since 2×1201012210021² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 92385554617 = 1201012210021 / (1 + 2 + 0 + 1 + 0 + 1 + 2 + 2 + 1 + 0 + 0 + 2 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201012209983 and 1201012210010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201012210051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46192777296 + ... + 46192777321.

It is an arithmetic number, because the mean of its divisors is an integer number (323349441163).

Almost surely, 2^{1201012210021} is an apocalyptic number.

It is an amenable number.

1201012210021 is a deficient number, since it is larger than the sum of its proper divisors (92385554631).

1201012210021 is an equidigital number, since it uses as much as digits as its factorization.

1201012210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92385554630.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1201012210021 its reverse (1200122101021), we get a palindrome (2401134311042).

The spelling of 1201012210021 in words is "one trillion, two hundred one billion, twelve million, two hundred ten thousand, twenty-one".