21457350736 has 40 divisors (see below), whose sum is σ = 41766326784. Its totient is φ = 10679022720.

The previous prime is 21457350727. The next prime is 21457350757. The reversal of 21457350736 is 63705375412.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21457350692 and 21457350701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7096521 + ... + 7099543.

Almost surely, 2^21457350736 is an apocalyptic number.

It is an amenable number.

21457350736 is a deficient number, since it is larger than the sum of its proper divisors (20308976048).

21457350736 is a wasteful number, since it uses less digits than its factorization.

21457350736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4939 (or 4933 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 43.

The spelling of 21457350736 in words is "twenty-one billion, four hundred fifty-seven million, three hundred fifty thousand, seven hundred thirty-six".