21250613632445 has 16 divisors (see below), whose sum is σ = 26196588485760. Its totient is φ = 16536822577344.

The previous prime is 21250613632439. The next prime is 21250613632471. The reversal of 21250613632445 is 54423631605212.

It is a cyclic number.

It is not a de Polignac number, because 21250613632445 - 2¹⁰ = 21250613631421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21250613632396 and 21250613632405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13836635 + ... + 15295544.

It is an arithmetic number, because the mean of its divisors is an integer number (1637286780360).

Almost surely, 2^{21250613632445} is an apocalyptic number.

It is an amenable number.

21250613632445 is a deficient number, since it is larger than the sum of its proper divisors (4945974853315).

21250613632445 is a wasteful number, since it uses less digits than its factorization.

21250613632445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29136164.

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 21250613632445 in words is "twenty-one trillion, two hundred fifty billion, six hundred thirteen million, six hundred thirty-two thousand, four hundred forty-five".