31210106420 has 48 divisors (see below), whose sum is σ = 69006685440. Its totient is φ = 11824258176.

The previous prime is 31210106419. The next prime is 31210106423. The reversal of 31210106420 is 2460101213.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31210106392 and 31210106401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31210106423) 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, 2541014 + ... + 2553266.

It is an arithmetic number, because the mean of its divisors is an integer number (1437639280).

Almost surely, 2^31210106420 is an apocalyptic number.

It is an amenable number.

31210106420 is an abundant number, since it is smaller than the sum of its proper divisors (37796579020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31210106420 is a wasteful number, since it uses less digits than its factorization.

31210106420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18984 (or 18982 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 31210106420 its reverse (2460101213), we get a palindrome (33670207633).

The spelling of 31210106420 in words is "thirty-one billion, two hundred ten million, one hundred six thousand, four hundred twenty".