21431478232 has 16 divisors (see below), whose sum is σ = 40220272800. Its totient is φ = 10706072160.

The previous prime is 21431478227. The next prime is 21431478251. The reversal of 21431478232 is 23287413412.

It is a junction number, because it is equal to n+sod(n) for n = 21431478191 and 21431478200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1198944 + ... + 1216687.

It is an arithmetic number, because the mean of its divisors is an integer number (2513767050).

Almost surely, 2^21431478232 is an apocalyptic number.

It is an amenable number.

21431478232 is a deficient number, since it is larger than the sum of its proper divisors (18788794568).

21431478232 is a wasteful number, since it uses less digits than its factorization.

21431478232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2416746 (or 2416742 counting only the distinct ones).

The product of its digits is 64512, while the sum is 37.

The spelling of 21431478232 in words is "twenty-one billion, four hundred thirty-one million, four hundred seventy-eight thousand, two hundred thirty-two".