21942364761 has 24 divisors (see below), whose sum is σ = 32152476096. Its totient is φ = 14417030880.

The previous prime is 21942364751. The next prime is 21942364771. The reversal of 21942364761 is 16746324912.

21942364761 is a `hidden beast` number, since 219 + 4 + 2 + 364 + 76 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (21942364751) and next prime (21942364771).

It is a de Polignac number, because none of the positive numbers 2^k-21942364761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21942364751) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2707231 + ... + 2715323.

It is an arithmetic number, because the mean of its divisors is an integer number (1339686504).

Almost surely, 2^21942364761 is an apocalyptic number.

It is an amenable number.

21942364761 is a deficient number, since it is larger than the sum of its proper divisors (10210111335).

21942364761 is a wasteful number, since it uses less digits than its factorization.

21942364761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12413 (or 12410 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The spelling of 21942364761 in words is "twenty-one billion, nine hundred forty-two million, three hundred sixty-four thousand, seven hundred sixty-one".