21669496612 has 6 divisors (see below), whose sum is σ = 37921619078. Its totient is φ = 10834748304.

The previous prime is 21669496591. The next prime is 21669496613.

21669496612 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 13487570496 + 8181926116 = 116136^2 + 90454^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21669496612.

It is not an unprimeable number, because it can be changed into a prime (21669496613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2708687073 + ... + 2708687080.

Almost surely, 2^21669496612 is an apocalyptic number.

It is an amenable number.

21669496612 is a deficient number, since it is larger than the sum of its proper divisors (16252122466).

21669496612 is a wasteful number, since it uses less digits than its factorization.

21669496612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5417374157 (or 5417374155 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 52.

The spelling of 21669496612 in words is "twenty-one billion, six hundred sixty-nine million, four hundred ninety-six thousand, six hundred twelve".