121021101111021 has 16 divisors (see below), whose sum is σ = 168767850516480. Its totient is φ = 76993820654960.

The previous prime is 121021101111017. The next prime is 121021101111023. The reversal of 121021101111021 is 120111101120121.

It is a cyclic number.

It is not a de Polignac number, because 121021101111021 - 2² = 121021101111017 is a prime.

It is a super-2 number, since 2×121021101111021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021101111023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2034690681 + ... + 2034750158.

It is an arithmetic number, because the mean of its divisors is an integer number (10547990657280).

Almost surely, 2^{121021101111021} is an apocalyptic number.

It is an amenable number.

121021101111021 is a deficient number, since it is larger than the sum of its proper divisors (47746749405459).

121021101111021 is a wasteful number, since it uses less digits than its factorization.

121021101111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4069441296.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 121021101111021 its reverse (120111101120121), we get a palindrome (241132202231142).

The spelling of 121021101111021 in words is "one hundred twenty-one trillion, twenty-one billion, one hundred one million, one hundred eleven thousand, twenty-one".