21546972942 has 32 divisors (see below), whose sum is σ = 48104876160. Its totient is φ = 6377538720.

The previous prime is 21546972919. The next prime is 21546972973. The reversal of 21546972942 is 24927964512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3793317 + ... + 3798992.

It is an arithmetic number, because the mean of its divisors is an integer number (1503277380).

Almost surely, 2^21546972942 is an apocalyptic number.

21546972942 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21546972942 is an abundant number, since it is smaller than the sum of its proper divisors (26557903218).

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

21546972942 is a wasteful number, since it uses less digits than its factorization.

21546972942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7592368.

The product of its digits is 2177280, while the sum is 51.

The spelling of 21546972942 in words is "twenty-one billion, five hundred forty-six million, nine hundred seventy-two thousand, nine hundred forty-two".