31212103123021 has 16 divisors (see below), whose sum is σ = 31312895152000. Its totient is φ = 31111456624128.

The previous prime is 31212103123013. The next prime is 31212103123043. The reversal of 31212103123021 is 12032130121213.

It is a cyclic number.

It is not a de Polignac number, because 31212103123021 - 2³ = 31212103123013 is a prime.

It is a super-2 number, since 2×31212103123021² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31212103122983 and 31212103123001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212103123051) 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, 3629732080 + ... + 3629740678.

It is an arithmetic number, because the mean of its divisors is an integer number (1957055947000).

Almost surely, 2^{31212103123021} is an apocalyptic number.

It is an amenable number.

31212103123021 is a deficient number, since it is larger than the sum of its proper divisors (100792028979).

31212103123021 is a wasteful number, since it uses less digits than its factorization.

31212103123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15748.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31212103123021 its reverse (12032130121213), we get a palindrome (43244233244234).

The spelling of 31212103123021 in words is "thirty-one trillion, two hundred twelve billion, one hundred three million, one hundred twenty-three thousand, twenty-one".