1201011020021 has 4 divisors (see below), whose sum is σ = 1208379185952. Its totient is φ = 1193642854092.

The previous prime is 1201011020017. The next prime is 1201011020047. The reversal of 1201011020021 is 1200201101021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1201011020021 - 2² = 1201011020017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1201011019984 and 1201011020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201011020221) 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, 3684082721 + ... + 3684083046.

It is an arithmetic number, because the mean of its divisors is an integer number (302094796488).

Almost surely, 2^{1201011020021} is an apocalyptic number.

It is an amenable number.

1201011020021 is a deficient number, since it is larger than the sum of its proper divisors (7368165931).

1201011020021 is an equidigital number, since it uses as much as digits as its factorization.

1201011020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7368165930.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1201011020021 its reverse (1200201101021), we get a palindrome (2401212121042).

The spelling of 1201011020021 in words is "one trillion, two hundred one billion, eleven million, twenty thousand, twenty-one".