31121101000021 has 8 divisors (see below), whose sum is σ = 32489737727040. Its totient is φ = 29753759721312.

The previous prime is 31121100999973. The next prime is 31121101000039. The reversal of 31121101000021 is 12000010112113.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31121101000021 - 2⁹ = 31121100999509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31121100999965 and 31121101000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121101000091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323812975 + ... + 323909068.

It is an arithmetic number, because the mean of its divisors is an integer number (4061217215880).

Almost surely, 2^{31121101000021} is an apocalyptic number.

It is an amenable number.

31121101000021 is a deficient number, since it is larger than the sum of its proper divisors (1368636727019).

31121101000021 is a wasteful number, since it uses less digits than its factorization.

31121101000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647724155.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 31121101000021 its reverse (12000010112113), we get a palindrome (43121111112134).

The spelling of 31121101000021 in words is "thirty-one trillion, one hundred twenty-one billion, one hundred one million, twenty-one", and thus it is an aban number.