21994963669 has 16 divisors (see below), whose sum is σ = 25740139392. Its totient is φ = 18401177088.

The previous prime is 21994963637. The next prime is 21994963693. The reversal of 21994963669 is 96636949912.

It is not a de Polignac number, because 21994963669 - 2⁵ = 21994963637 is a prime.

It is a super-2 number, since 2×21994963669² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21994963669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21994963769) 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, 405837 + ... + 456829.

It is an arithmetic number, because the mean of its divisors is an integer number (1608758712).

Almost surely, 2^21994963669 is an apocalyptic number.

It is an amenable number.

21994963669 is a deficient number, since it is larger than the sum of its proper divisors (3745175723).

21994963669 is a wasteful number, since it uses less digits than its factorization.

21994963669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52476.

The product of its digits is 34012224, while the sum is 64.

The spelling of 21994963669 in words is "twenty-one billion, nine hundred ninety-four million, nine hundred sixty-three thousand, six hundred sixty-nine".