21431233120 has 48 divisors (see below), whose sum is σ = 55234137168. Its totient is φ = 7793175040.

The previous prime is 21431233093. The next prime is 21431233163. The reversal of 21431233120 is 2133213412.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21431233091 and 21431233100.

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, 6086659 + ... + 6090178.

It is an arithmetic number, because the mean of its divisors is an integer number (1150711191).

Almost surely, 2^21431233120 is an apocalyptic number.

21431233120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21431233120 is an abundant number, since it is smaller than the sum of its proper divisors (33802904048).

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

21431233120 is a wasteful number, since it uses less digits than its factorization.

21431233120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12176863 (or 12176855 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21431233120 its reverse (2133213412), we get a palindrome (23564446532).

The spelling of 21431233120 in words is "twenty-one billion, four hundred thirty-one million, two hundred thirty-three thousand, one hundred twenty".