3121121211021 has 12 divisors (see below), whose sum is σ = 4918130393280. Its totient is φ = 1891588612680.

The previous prime is 3121121211017. The next prime is 3121121211053. The reversal of 3121121211021 is 1201121211213.

It is a happy number.

3121121211021 is a `hidden beast` number, since 312 + 1 + 121 + 211 + 0 + 21 = 666.

It is not a de Polignac number, because 3121121211021 - 2² = 3121121211017 is a prime.

It is a super-2 number, since 2×3121121211021² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3121121210985 and 3121121211003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121121211011) 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, 15763238341 + ... + 15763238538.

It is an arithmetic number, because the mean of its divisors is an integer number (409844199440).

Almost surely, 2^{3121121211021} is an apocalyptic number.

It is an amenable number.

3121121211021 is a deficient number, since it is larger than the sum of its proper divisors (1797009182259).

3121121211021 is a wasteful number, since it uses less digits than its factorization.

3121121211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31526476896 (or 31526476893 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 3121121211021 its reverse (1201121211213), we get a palindrome (4322242422234).

The spelling of 3121121211021 in words is "three trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred eleven thousand, twenty-one".