21947562942 has 8 divisors (see below), whose sum is σ = 43895125896. Its totient is φ = 7315854312.

The previous prime is 21947562919. The next prime is 21947562991. The reversal of 21947562942 is 24926574912.

It is a sphenic number, since it is the product of 3 distinct primes.

21947562942 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1828963573 + ... + 1828963584.

It is an arithmetic number, because the mean of its divisors is an integer number (5486890737).

Almost surely, 2^21947562942 is an apocalyptic number.

21947562942 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21947562942 is a wasteful number, since it uses less digits than its factorization.

21947562942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3657927162.

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

The spelling of 21947562942 in words is "twenty-one billion, nine hundred forty-seven million, five hundred sixty-two thousand, nine hundred forty-two".