21507607036 has 6 divisors (see below), whose sum is σ = 37638312320. Its totient is φ = 10753803516.

The previous prime is 21507607031. The next prime is 21507607063. The reversal of 21507607036 is 63070670512.

It is a junction number, because it is equal to n+sod(n) for n = 21507606986 and 21507607004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21507607031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2688450876 + ... + 2688450883.

Almost surely, 2^21507607036 is an apocalyptic number.

It is an amenable number.

21507607036 is a deficient number, since it is larger than the sum of its proper divisors (16130705284).

21507607036 is a wasteful number, since it uses less digits than its factorization.

21507607036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5376901763 (or 5376901761 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 37.

The spelling of 21507607036 in words is "twenty-one billion, five hundred seven million, six hundred seven thousand, thirty-six".