21431432000 has 112 divisors (see below), whose sum is σ = 57900173760. Its totient is φ = 7793216000.

The previous prime is 21431431981. The next prime is 21431432003. The reversal of 21431432000 is 23413412.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431432003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33770 + ... + 209769.

Almost surely, 2^21431432000 is an apocalyptic number.

21431432000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21431432000 is an abundant number, since it is smaller than the sum of its proper divisors (36468741760).

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

21431432000 is a wasteful number, since it uses less digits than its factorization.

21431432000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243577 (or 243557 counting only the distinct ones).

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

Adding to 21431432000 its reverse (23413412), we get a palindrome (21454845412).

The spelling of 21431432000 in words is "twenty-one billion, four hundred thirty-one million, four hundred thirty-two thousand".