121211022120021 has 12 divisors (see below), whose sum is σ = 175239331108972. Its totient is φ = 80735004878976.

The previous prime is 121211022119983. The next prime is 121211022120061. The reversal of 121211022120021 is 120021220112121.

121211022120021 is a `hidden beast` number, since 1 + 212 + 1 + 10 + 221 + 200 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 23665987152900 + 97545034967121 = 4864770^2 + 9876489^2 .

It is not a de Polignac number, because 121211022120021 - 2²⁹ = 121210485249109 is a prime.

It is a super-2 number, since 2×121211022120021² (a number of 29 digits) contains 22 as substring.

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 = 121211022119976 and 121211022120003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211022120061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6028589476 + ... + 6028609581.

Almost surely, 2^{121211022120021} is an apocalyptic number.

It is an amenable number.

121211022120021 is a deficient number, since it is larger than the sum of its proper divisors (54028308988951).

121211022120021 is a wasteful number, since it uses less digits than its factorization.

121211022120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12057200180 (or 12057200177 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121211022120021 its reverse (120021220112121), we get a palindrome (241232242232142).

The spelling of 121211022120021 in words is "one hundred twenty-one trillion, two hundred eleven billion, twenty-two million, one hundred twenty thousand, twenty-one".