21653450542536 has 32 divisors (see below), whose sum is σ = 54326272730400. Its totient is φ = 7192130664320.

The previous prime is 21653450542447. The next prime is 21653450542553. The reversal of 21653450542536 is 63524505435612.

It is a super-2 number, since 2×21653450542536² (a number of 27 digits) contains 22 as substring.

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, 1605379566 + ... + 1605393053.

It is an arithmetic number, because the mean of its divisors is an integer number (1697696022825).

Almost surely, 2^{21653450542536} is an apocalyptic number.

It is an amenable number.

21653450542536 is an abundant number, since it is smaller than the sum of its proper divisors (32672822187864).

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

21653450542536 is a wasteful number, since it uses less digits than its factorization.

21653450542536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3210772909 (or 3210772905 counting only the distinct ones).

The product of its (nonzero) digits is 12960000, while the sum is 51.

The spelling of 21653450542536 in words is "twenty-one trillion, six hundred fifty-three billion, four hundred fifty million, five hundred forty-two thousand, five hundred thirty-six".