21401620110642 has 16 divisors (see below), whose sum is σ = 43504932684672. Its totient is φ = 7016924626320.

The previous prime is 21401620110599. The next prime is 21401620110679. The reversal of 21401620110642 is 24601102610412.

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 7 ways as a sum of consecutive naturals, for example, 29237185578 + ... + 29237186309.

It is an arithmetic number, because the mean of its divisors is an integer number (2719058292792).

Almost surely, 2^{21401620110642} is an apocalyptic number.

21401620110642 is an abundant number, since it is smaller than the sum of its proper divisors (22103312574030).

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

21401620110642 is a wasteful number, since it uses less digits than its factorization.

21401620110642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58474371953.

The product of its (nonzero) digits is 4608, while the sum is 30.

The spelling of 21401620110642 in words is "twenty-one trillion, four hundred one billion, six hundred twenty million, one hundred ten thousand, six hundred forty-two".