21433131312 has 40 divisors (see below), whose sum is σ = 56413625904. Its totient is φ = 7009576704.

The previous prime is 21433131299. The next prime is 21433131329. The reversal of 21433131312 is 21313133412.

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

It is a nude number because it is divisible by every one of its digits.

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, 4209943 + ... + 4215030.

Almost surely, 2^21433131312 is an apocalyptic number.

It is an amenable number.

21433131312 is an abundant number, since it is smaller than the sum of its proper divisors (34980494592).

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

21433131312 is a wasteful number, since it uses less digits than its factorization.

21433131312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8425037 (or 8425031 counting only the distinct ones).

The product of its digits is 1296, while the sum is 24.

Adding to 21433131312 its reverse (21313133412), we get a palindrome (42746264724).

The spelling of 21433131312 in words is "twenty-one billion, four hundred thirty-three million, one hundred thirty-one thousand, three hundred twelve".