21601200631542 has 64 divisors (see below), whose sum is σ = 51522769059840. Its totient is φ = 5903216805024.

The previous prime is 21601200631529. The next prime is 21601200631589. The reversal of 21601200631542 is 24513600210612.

It is a super-2 number, since 2×21601200631542² (a number of 27 digits) contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 26828059 + ... + 27621497.

It is an arithmetic number, because the mean of its divisors is an integer number (805043266560).

Almost surely, 2^{21601200631542} is an apocalyptic number.

21601200631542 is an abundant number, since it is smaller than the sum of its proper divisors (29921568428298).

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

21601200631542 is a wasteful number, since it uses less digits than its factorization.

21601200631542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821657.

The product of its (nonzero) digits is 17280, while the sum is 33.

The spelling of 21601200631542 in words is "twenty-one trillion, six hundred one billion, two hundred million, six hundred thirty-one thousand, five hundred forty-two".