21525681115602 has 32 divisors (see below), whose sum is σ = 48508577170560. Its totient is φ = 7074167501520.

The previous prime is 21525681115571. The next prime is 21525681115661. The reversal of 21525681115602 is 20651118652512.

21525681115602 is a `hidden beast` number, since 2 + 1 + 5 + 2 + 5 + 6 + 81 + 1 + 1 + 560 + 2 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2807205493 + ... + 2807213160.

It is an arithmetic number, because the mean of its divisors is an integer number (1515893036580).

Almost surely, 2^{21525681115602} is an apocalyptic number.

21525681115602 is an abundant number, since it is smaller than the sum of its proper divisors (26982896054958).

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

21525681115602 is a wasteful number, since it uses less digits than its factorization.

21525681115602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5614418735 (or 5614418729 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 45.

The spelling of 21525681115602 in words is "twenty-one trillion, five hundred twenty-five billion, six hundred eighty-one million, one hundred fifteen thousand, six hundred two".