21942412791 has 16 divisors (see below), whose sum is σ = 31509802464. Its totient is φ = 13501845504.

The previous prime is 21942412783. The next prime is 21942412829. The reversal of 21942412791 is 19721424912.

It is not a de Polignac number, because 21942412791 - 2³ = 21942412783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21942412741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 696615 + ... + 727431.

It is an arithmetic number, because the mean of its divisors is an integer number (1969362654).

Almost surely, 2^21942412791 is an apocalyptic number.

21942412791 is a deficient number, since it is larger than the sum of its proper divisors (9567389673).

21942412791 is a wasteful number, since it uses less digits than its factorization.

21942412791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49090.

The product of its digits is 72576, while the sum is 42.

The spelling of 21942412791 in words is "twenty-one billion, nine hundred forty-two million, four hundred twelve thousand, seven hundred ninety-one".