1201211110021 has 4 divisors (see below), whose sum is σ = 1293611964652. Its totient is φ = 1108810255392.

The previous prime is 1201211109997. The next prime is 1201211110039. The reversal of 1201211110021 is 1200111121021.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 422810757121 + 778400352900 = 650239^2 + 882270^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201211110021 - 2⁹ = 1201211109509 is a prime.

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: 92400854617 = 1201211110021 / (1 + 2 + 0 + 1 + 2 + 1 + 1 + 1 + 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 = 1201211109983 and 1201211110010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201211110081) 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, 46200427296 + ... + 46200427321.

It is an arithmetic number, because the mean of its divisors is an integer number (323402991163).

Almost surely, 2^{1201211110021} is an apocalyptic number.

It is an amenable number.

1201211110021 is a deficient number, since it is larger than the sum of its proper divisors (92400854631).

1201211110021 is an equidigital number, since it uses as much as digits as its factorization.

1201211110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92400854630.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1201211110021 its reverse (1200111121021), we get a palindrome (2401322231042).

The spelling of 1201211110021 in words is "one trillion, two hundred one billion, two hundred eleven million, one hundred ten thousand, twenty-one".