21431366632 has 16 divisors (see below), whose sum is σ = 43274875140. Its totient is φ = 9891399936.

The previous prime is 21431366629. The next prime is 21431366633. The reversal of 21431366632 is 23666313412.

It can be written as a sum of positive squares in 2 ways, for example, as 21259389636 + 171976996 = 145806^2 + 13114^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21431366591 and 21431366600.

It is not an unprimeable number, because it can be changed into a prime (21431366633) 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, 103035313 + ... + 103035520.

Almost surely, 2^21431366632 is an apocalyptic number.

It is an amenable number.

21431366632 is an abundant number, since it is smaller than the sum of its proper divisors (21843508508).

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

21431366632 is a wasteful number, since it uses less digits than its factorization.

21431366632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206070852 (or 206070848 counting only the distinct ones).

The product of its digits is 93312, while the sum is 37.

The spelling of 21431366632 in words is "twenty-one billion, four hundred thirty-one million, three hundred sixty-six thousand, six hundred thirty-two".