31021423420 has 48 divisors (see below), whose sum is σ = 73206423360. Its totient is φ = 10956059136.

The previous prime is 31021423369. The next prime is 31021423439. The reversal of 31021423420 is 2432412013.

It is a super-2 number, since 2×31021423420² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31021423391 and 31021423400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2587785 + ... + 2599744.

It is an arithmetic number, because the mean of its divisors is an integer number (1525133820).

Almost surely, 2^31021423420 is an apocalyptic number.

It is an amenable number.

31021423420 is an abundant number, since it is smaller than the sum of its proper divisors (42184999940).

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

31021423420 is a wasteful number, since it uses less digits than its factorization.

31021423420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5187574 (or 5187572 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 31021423420 its reverse (2432412013), we get a palindrome (33453835433).

The spelling of 31021423420 in words is "thirty-one billion, twenty-one million, four hundred twenty-three thousand, four hundred twenty".