21451053025215 has 24 divisors (see below), whose sum is σ = 40561991175888. Its totient is φ = 10400510557440.

The previous prime is 21451053025189. The next prime is 21451053025279. The reversal of 21451053025215 is 51252035015412.

21451053025215 is a `hidden beast` number, since 2 + 14 + 51 + 0 + 530 + 2 + 52 + 15 = 666.

It is not a de Polignac number, because 21451053025215 - 2¹⁴ = 21451053008831 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21451053025215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21667729834 + ... + 21667730823.

It is an arithmetic number, because the mean of its divisors is an integer number (1690082965662).

Almost surely, 2^{21451053025215} is an apocalyptic number.

21451053025215 is a deficient number, since it is larger than the sum of its proper divisors (19110938150673).

21451053025215 is a wasteful number, since it uses less digits than its factorization.

21451053025215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43335460679 (or 43335460676 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 36.

The spelling of 21451053025215 in words is "twenty-one trillion, four hundred fifty-one billion, fifty-three million, twenty-five thousand, two hundred fifteen".