21298968942 has 64 divisors (see below), whose sum is σ = 45410699520. Its totient is φ = 6636704256.

The previous prime is 21298968931. The next prime is 21298968949. The reversal of 21298968942 is 24986989212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21298968949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12775993 + ... + 12777659.

It is an arithmetic number, because the mean of its divisors is an integer number (709542180).

Almost surely, 2^21298968942 is an apocalyptic number.

21298968942 is an abundant number, since it is smaller than the sum of its proper divisors (24111730578).

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

21298968942 is a wasteful number, since it uses less digits than its factorization.

21298968942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2465.

The product of its digits is 8957952, while the sum is 60.

The spelling of 21298968942 in words is "twenty-one billion, two hundred ninety-eight million, nine hundred sixty-eight thousand, nine hundred forty-two".