21869976 has 16 divisors (see below), whose sum is σ = 54675000. Its totient is φ = 7289984.

The previous prime is 21869963. The next prime is 21869983. The reversal of 21869976 is 67996812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455601 + ... + 455648.

Almost surely, 2^21869976 is an apocalyptic number.

It is an amenable number.

21869976 is an abundant number, since it is smaller than the sum of its proper divisors (32805024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21869976 is a wasteful number, since it uses less digits than its factorization.

21869976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911258 (or 911254 counting only the distinct ones).

The product of its digits is 326592, while the sum is 48.

The square root of 21869976 is about 4676.5346144341. The cubic root of 21869976 is about 279.6508232401.

The spelling of 21869976 in words is "twenty-one million, eight hundred sixty-nine thousand, nine hundred seventy-six".