21942368156 has 12 divisors (see below), whose sum is σ = 38443852440. Its totient is φ = 10958410320.

The previous prime is 21942368141. The next prime is 21942368171. The reversal of 21942368156 is 65186324912.

It is an interprime number because it is at equal distance from previous prime (21942368141) and next prime (21942368171).

It is a self number, because there is not a number n which added to its sum of digits gives 21942368156.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3189575 + ... + 3196446.

It is an arithmetic number, because the mean of its divisors is an integer number (3203654370).

Almost surely, 2^21942368156 is an apocalyptic number.

It is an amenable number.

21942368156 is a deficient number, since it is larger than the sum of its proper divisors (16501484284).

21942368156 is a wasteful number, since it uses less digits than its factorization.

21942368156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6386884 (or 6386882 counting only the distinct ones).

The product of its digits is 622080, while the sum is 47.

The spelling of 21942368156 in words is "twenty-one billion, nine hundred forty-two million, three hundred sixty-eight thousand, one hundred fifty-six".