21940943769 has 20 divisors (see below), whose sum is σ = 32783604480. Its totient is φ = 14623892280.

The previous prime is 21940943719. The next prime is 21940943807. The reversal of 21940943769 is 96734904912.

It is not a de Polignac number, because 21940943769 - 2⁸ = 21940943513 is a prime.

It is a super-2 number, since 2×21940943769² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21940943719) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 346564 + ... + 404954.

It is an arithmetic number, because the mean of its divisors is an integer number (1639180224).

Almost surely, 2^21940943769 is an apocalyptic number.

It is an amenable number.

21940943769 is a deficient number, since it is larger than the sum of its proper divisors (10842660711).

21940943769 is an equidigital number, since it uses as much as digits as its factorization.

21940943769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63042 (or 63033 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The spelling of 21940943769 in words is "twenty-one billion, nine hundred forty million, nine hundred forty-three thousand, seven hundred sixty-nine".