21869696 has 16 divisors (see below), whose sum is σ = 43568790. Its totient is φ = 10934784.

The previous prime is 21869693. The next prime is 21869699. The reversal of 21869696 is 69696812.

It is an interprime number because it is at equal distance from previous prime (21869693) and next prime (21869699).

It can be written as a sum of positive squares in only one way, i.e., 13249600 + 8620096 = 3640^2 + 2936^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 21869696.

It is not an unprimeable number, because it can be changed into a prime (21869693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85301 + ... + 85556.

Almost surely, 2^21869696 is an apocalyptic number.

It is an amenable number.

21869696 is a deficient number, since it is larger than the sum of its proper divisors (21699094).

21869696 is an equidigital number, since it uses as much as digits as its factorization.

21869696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170871 (or 170859 counting only the distinct ones).

The product of its digits is 279936, while the sum is 47.

The square root of 21869696 is about 4676.5046776412. The cubic root of 21869696 is about 279.6496297841.

The spelling of 21869696 in words is "twenty-one million, eight hundred sixty-nine thousand, six hundred ninety-six".