21506546325042 has 24 divisors (see below), whose sum is σ = 46617892079616. Its totient is φ = 7165714153176.

The previous prime is 21506546324959. The next prime is 21506546325053. The reversal of 21506546325042 is 24052364560512.

21506546325042 is a `hidden beast` number, since 2 + 1 + 5 + 0 + 6 + 5 + 4 + 632 + 5 + 0 + 4 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 261176178 + ... + 261258509.

It is an arithmetic number, because the mean of its divisors is an integer number (1942412169984).

Almost surely, 2^{21506546325042} is an apocalyptic number.

21506546325042 is an abundant number, since it is smaller than the sum of its proper divisors (25111345754574).

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

21506546325042 is a wasteful number, since it uses less digits than its factorization.

21506546325042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522436982 (or 522436979 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 45.

The spelling of 21506546325042 in words is "twenty-one trillion, five hundred six billion, five hundred forty-six million, three hundred twenty-five thousand, forty-two".