121221021011021 has 4 divisors (see below), whose sum is σ = 121482837471552. Its totient is φ = 120959204550492.

The previous prime is 121221021011003. The next prime is 121221021011071. The reversal of 121221021011021 is 120110120122121.

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 a de Polignac number, because none of the positive numbers 2^k-121221021011021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221021011071) 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, 130908229571 + ... + 130908230496.

It is an arithmetic number, because the mean of its divisors is an integer number (30370709367888).

Almost surely, 2^{121221021011021} is an apocalyptic number.

It is an amenable number.

121221021011021 is a deficient number, since it is larger than the sum of its proper divisors (261816460531).

121221021011021 is an equidigital number, since it uses as much as digits as its factorization.

121221021011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261816460530.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 121221021011021 its reverse (120110120122121), we get a palindrome (241331141133142).

The spelling of 121221021011021 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, eleven thousand, twenty-one".