21431423132 has 12 divisors (see below), whose sum is σ = 42862846320. Its totient is φ = 9184895616.

The previous prime is 21431423131. The next prime is 21431423137. The reversal of 21431423132 is 23132413412.

21431423132 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431423131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382703957 + ... + 382704012.

It is an arithmetic number, because the mean of its divisors is an integer number (3571903860).

Almost surely, 2^21431423132 is an apocalyptic number.

It is an amenable number.

21431423132 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21431423132 is a wasteful number, since it uses less digits than its factorization.

21431423132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765407980 (or 765407978 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

Adding to 21431423132 its reverse (23132413412), we get a palindrome (44563836544).

The spelling of 21431423132 in words is "twenty-one billion, four hundred thirty-one million, four hundred twenty-three thousand, one hundred thirty-two".