2312121111021 has 64 divisors (see below), whose sum is σ = 3594791485440. Its totient is φ = 1465948471680.

The previous prime is 2312121111011. The next prime is 2312121111073. The reversal of 2312121111021 is 1201111212132.

It is a happy number.

It is not a de Polignac number, because 2312121111021 - 2²² = 2312116916717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2312121110985 and 2312121111003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2312121111011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 338868216 + ... + 338875038.

It is an arithmetic number, because the mean of its divisors is an integer number (56168616960).

Almost surely, 2^{2312121111021} is an apocalyptic number.

It is an amenable number.

2312121111021 is a deficient number, since it is larger than the sum of its proper divisors (1282670374419).

2312121111021 is a wasteful number, since it uses less digits than its factorization.

2312121111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9903 (or 9897 counting only the distinct ones).

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

Adding to 2312121111021 its reverse (1201111212132), we get a palindrome (3513232323153).

The spelling of 2312121111021 in words is "two trillion, three hundred twelve billion, one hundred twenty-one million, one hundred eleven thousand, twenty-one".