21245869608651 has 24 divisors (see below), whose sum is σ = 32494060426464. Its totient is φ = 13330586845440.

The previous prime is 21245869608599. The next prime is 21245869608659. The reversal of 21245869608651 is 15680696854212.

21245869608651 is a `hidden beast` number, since 2 + 1 + 2 + 458 + 69 + 60 + 8 + 65 + 1 = 666.

It is not a de Polignac number, because 21245869608651 - 2⁴¹ = 19046846353099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21245869608659) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13198266 + ... + 14720256.

It is an arithmetic number, because the mean of its divisors is an integer number (1353919184436).

Almost surely, 2^{21245869608651} is an apocalyptic number.

21245869608651 is a deficient number, since it is larger than the sum of its proper divisors (11248190817813).

21245869608651 is a wasteful number, since it uses less digits than its factorization.

21245869608651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1613251 (or 1613248 counting only the distinct ones).

The product of its (nonzero) digits is 49766400, while the sum is 63.

The spelling of 21245869608651 in words is "twenty-one trillion, two hundred forty-five billion, eight hundred sixty-nine million, six hundred eight thousand, six hundred fifty-one".