21453631473028 has 24 divisors (see below), whose sum is σ = 37925403907160. Its totient is φ = 10617994563840.

The previous prime is 21453631472989. The next prime is 21453631473037. The reversal of 21453631473028 is 82037413635412.

It can be written as a sum of positive squares in 4 ways, for example, as 792043041024 + 20661588432004 = 889968^2 + 4545502^2 .

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, 23651601 + ... + 24541912.

Almost surely, 2^{21453631473028} is an apocalyptic number.

It is an amenable number.

21453631473028 is a deficient number, since it is larger than the sum of its proper divisors (16471772434132).

21453631473028 is a wasteful number, since it uses less digits than its factorization.

21453631473028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48194647 (or 48194645 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 49.

The spelling of 21453631473028 in words is "twenty-one trillion, four hundred fifty-three billion, six hundred thirty-one million, four hundred seventy-three thousand, twenty-eight".