231220212432 has 40 divisors (see below), whose sum is σ = 651620600160. Its totient is φ = 70066730880.

The previous prime is 231220212427. The next prime is 231220212451. The reversal of 231220212432 is 234212022132.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218958007 + ... + 218959062.

It is an arithmetic number, because the mean of its divisors is an integer number (16290515004).

Almost surely, 2^231220212432 is an apocalyptic number.

231220212432 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

231220212432 is an abundant number, since it is smaller than the sum of its proper divisors (420400387728).

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

231220212432 is a wasteful number, since it uses less digits than its factorization.

231220212432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437917091 (or 437917085 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 231220212432 its reverse (234212022132), we get a palindrome (465432234564).

The spelling of 231220212432 in words is "two hundred thirty-one billion, two hundred twenty million, two hundred twelve thousand, four hundred thirty-two".