21154426670128 has 20 divisors (see below), whose sum is σ = 40988355198400. Its totient is φ = 10576786618944.

The previous prime is 21154426670101. The next prime is 21154426670171. The reversal of 21154426670128 is 82107662445112.

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, 26260575 + ... + 27054142.

It is an arithmetic number, because the mean of its divisors is an integer number (2049417759920).

Almost surely, 2^{21154426670128} is an apocalyptic number.

It is an amenable number.

21154426670128 is a deficient number, since it is larger than the sum of its proper divisors (19833928528272).

21154426670128 is a wasteful number, since it uses less digits than its factorization.

21154426670128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53339524 (or 53339518 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 49.

The spelling of 21154426670128 in words is "twenty-one trillion, one hundred fifty-four billion, four hundred twenty-six million, six hundred seventy thousand, one hundred twenty-eight".