31123322110021 has 4 divisors (see below), whose sum is σ = 32476510027872. Its totient is φ = 29770134192172.

The previous prime is 31123322109977. The next prime is 31123322110033. The reversal of 31123322110021 is 12001122332113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31123322110021 - 2²⁵ = 31123288555589 is a prime.

It is a super-2 number, since 2×31123322110021² (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 = 31123322109974 and 31123322110001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123322110051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 676593958891 + ... + 676593958936.

It is an arithmetic number, because the mean of its divisors is an integer number (8119127506968).

Almost surely, 2^{31123322110021} is an apocalyptic number.

It is an amenable number.

31123322110021 is a deficient number, since it is larger than the sum of its proper divisors (1353187917851).

31123322110021 is a wasteful number, since it uses less digits than its factorization.

31123322110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353187917850.

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

Adding to 31123322110021 its reverse (12001122332113), we get a palindrome (43124444442134).

The spelling of 31123322110021 in words is "thirty-one trillion, one hundred twenty-three billion, three hundred twenty-two million, one hundred ten thousand, twenty-one".