31120103210021 has 4 divisors (see below), whose sum is σ = 35565832240032. Its totient is φ = 26674374180012.

The previous prime is 31120103210003. The next prime is 31120103210039. The reversal of 31120103210021 is 12001230102113.

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 an interprime number because it is at equal distance from previous prime (31120103210003) and next prime (31120103210039).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31120103210021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120103218021) 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, 2222864514995 + ... + 2222864515008.

It is an arithmetic number, because the mean of its divisors is an integer number (8891458060008).

Almost surely, 2^{31120103210021} is an apocalyptic number.

It is an amenable number.

31120103210021 is a deficient number, since it is larger than the sum of its proper divisors (4445729030011).

31120103210021 is an equidigital number, since it uses as much as digits as its factorization.

31120103210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4445729030010.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31120103210021 its reverse (12001230102113), we get a palindrome (43121333312134).

The spelling of 31120103210021 in words is "thirty-one trillion, one hundred twenty billion, one hundred three million, two hundred ten thousand, twenty-one".