21251011115430 has 96 divisors (see below), whose sum is σ = 55535351010048. Its totient is φ = 5637990120000.

The previous prime is 21251011115401. The next prime is 21251011115497. The reversal of 21251011115430 is 3451111015212.

21251011115430 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 1 + 0 + 1 + 111 + 543 + 0 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21251011115394 and 21251011115403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19507045 + ... + 20567615.

It is an arithmetic number, because the mean of its divisors is an integer number (578493239688).

Almost surely, 2^{21251011115430} is an apocalyptic number.

21251011115430 is an abundant number, since it is smaller than the sum of its proper divisors (34284339894618).

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

21251011115430 is a wasteful number, since it uses less digits than its factorization.

21251011115430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061722 (or 1061719 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

The spelling of 21251011115430 in words is "twenty-one trillion, two hundred fifty-one billion, eleven million, one hundred fifteen thousand, four hundred thirty".