21250641460455 has 48 divisors (see below), whose sum is σ = 40239707433120. Its totient is φ = 10288808928000.

The previous prime is 21250641460393. The next prime is 21250641460549. The reversal of 21250641460455 is 55406414605212.

21250641460455 is a `hidden beast` number, since 2 + 1 + 2 + 50 + 6 + 4 + 146 + 0 + 455 = 666.

It is not a de Polignac number, because 21250641460455 - 2²³ = 21250633071847 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21250641460455.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29924496 + ... + 30626405.

It is an arithmetic number, because the mean of its divisors is an integer number (838327238190).

Almost surely, 2^{21250641460455} is an apocalyptic number.

21250641460455 is a deficient number, since it is larger than the sum of its proper divisors (18989065972665).

21250641460455 is a wasteful number, since it uses less digits than its factorization.

21250641460455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60551632 (or 60551629 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 45.

The spelling of 21250641460455 in words is "twenty-one trillion, two hundred fifty billion, six hundred forty-one million, four hundred sixty thousand, four hundred fifty-five".