21916507942992 has 80 divisors (see below), whose sum is σ = 60974663621760. Its totient is φ = 6743340212736.

The previous prime is 21916507942891. The next prime is 21916507942997. The reversal of 21916507942992 is 29924970561912.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21916507942997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21183109 + ... + 22193627.

It is an arithmetic number, because the mean of its divisors is an integer number (762183295272).

Almost surely, 2^{21916507942992} is an apocalyptic number.

It is an amenable number.

21916507942992 is an abundant number, since it is smaller than the sum of its proper divisors (39058155678768).

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

21916507942992 is a wasteful number, since it uses less digits than its factorization.

21916507942992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045300 (or 1045294 counting only the distinct ones).

The product of its (nonzero) digits is 44089920, while the sum is 66.

The spelling of 21916507942992 in words is "twenty-one trillion, nine hundred sixteen billion, five hundred seven million, nine hundred forty-two thousand, nine hundred ninety-two".