21275459536 has 20 divisors (see below), whose sum is σ = 41233464064. Its totient is φ = 10634565600.

The previous prime is 21275459521. The next prime is 21275459561. The reversal of 21275459536 is 63595457212.

It is a self number, because there is not a number n which added to its sum of digits gives 21275459536.

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, 141810 + ... + 250321.

Almost surely, 2^21275459536 is an apocalyptic number.

It is an amenable number.

21275459536 is a deficient number, since it is larger than the sum of its proper divisors (19958004528).

21275459536 is a wasteful number, since it uses less digits than its factorization.

21275459536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395530 (or 395524 counting only the distinct ones).

The product of its digits is 2268000, while the sum is 49.

The spelling of 21275459536 in words is "twenty-one billion, two hundred seventy-five million, four hundred fifty-nine thousand, five hundred thirty-six".