21430732636 has 48 divisors (see below), whose sum is σ = 40067580672. Its totient is φ = 10012262400.

The previous prime is 21430732621. The next prime is 21430732639. The reversal of 21430732636 is 63623703412.

It is a junction number, because it is equal to n+sod(n) for n = 21430732595 and 21430732604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430732639) 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, 471420 + ... + 514876.

It is an arithmetic number, because the mean of its divisors is an integer number (834741264).

Almost surely, 2^21430732636 is an apocalyptic number.

It is an amenable number.

21430732636 is a deficient number, since it is larger than the sum of its proper divisors (18636848036).

21430732636 is a wasteful number, since it uses less digits than its factorization.

21430732636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43630 (or 43628 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 37.

The spelling of 21430732636 in words is "twenty-one billion, four hundred thirty million, seven hundred thirty-two thousand, six hundred thirty-six".