121210111021 has 16 divisors (see below), whose sum is σ = 127630540800. Its totient is φ = 114887768688.

The previous prime is 121210111007. The next prime is 121210111081. The reversal of 121210111021 is 120111012121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121210111021 - 2⁷ = 121210110893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121210110992 and 121210111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210111081) 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, 2425990 + ... + 2475448.

It is an arithmetic number, because the mean of its divisors is an integer number (7976908800).

Almost surely, 2^121210111021 is an apocalyptic number.

It is an amenable number.

121210111021 is a deficient number, since it is larger than the sum of its proper divisors (6420429779).

121210111021 is a wasteful number, since it uses less digits than its factorization.

121210111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50448.

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

Adding to 121210111021 its reverse (120111012121), we get a palindrome (241321123142).

The spelling of 121210111021 in words is "one hundred twenty-one billion, two hundred ten million, one hundred eleven thousand, twenty-one".