31232213430 has 128 divisors (see below), whose sum is σ = 83067088896. Its totient is φ = 7451875200.

The previous prime is 31232213417. The next prime is 31232213443. The reversal of 31232213430 is 3431223213.

It is an interprime number because it is at equal distance from previous prime (31232213417) and next prime (31232213443).

It is a self number, because there is not a number n which added to its sum of digits gives 31232213430.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26311297 + ... + 26312483.

It is an arithmetic number, because the mean of its divisors is an integer number (648961632).

Almost surely, 2^31232213430 is an apocalyptic number.

31232213430 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31232213430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41533544448).

31232213430 is an abundant number, since it is smaller than the sum of its proper divisors (51834875466).

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

31232213430 is a wasteful number, since it uses less digits than its factorization.

31232213430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2402.

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 31232213430 its reverse (3431223213), we get a palindrome (34663436643).

The spelling of 31232213430 in words is "thirty-one billion, two hundred thirty-two million, two hundred thirteen thousand, four hundred thirty".