31232021240 has 128 divisors (see below), whose sum is σ = 85102617600. Its totient is φ = 10070231040.

The previous prime is 31232021237. The next prime is 31232021251. The reversal of 31232021240 is 4212023213.

It is a super-2 number, since 2×31232021240² (a number of 22 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10142021 + ... + 10145099.

It is an arithmetic number, because the mean of its divisors is an integer number (664864200).

Almost surely, 2^31232021240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31232021240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42551308800).

31232021240 is an abundant number, since it is smaller than the sum of its proper divisors (53870596360).

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

31232021240 is a wasteful number, since it uses less digits than its factorization.

31232021240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5245 (or 5241 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31232021240 its reverse (4212023213), we get a palindrome (35444044453).

The spelling of 31232021240 in words is "thirty-one billion, two hundred thirty-two million, twenty-one thousand, two hundred forty".