21120600642 has 24 divisors (see below), whose sum is σ = 42314157936. Its totient is φ = 7028061624.

The previous prime is 21120600593. The next prime is 21120600649. The reversal of 21120600642 is 24600602112.

It is not an unprimeable number, because it can be changed into a prime (21120600649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2294373 + ... + 2303559.

It is an arithmetic number, because the mean of its divisors is an integer number (1763089914).

Almost surely, 2^21120600642 is an apocalyptic number.

21120600642 is an abundant number, since it is smaller than the sum of its proper divisors (21193557294).

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

21120600642 is an frugal number, since it uses more digits than its factorization.

21120600642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10430 (or 9811 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The spelling of 21120600642 in words is "twenty-one billion, one hundred twenty million, six hundred thousand, six hundred forty-two".