21869044 has 12 divisors (see below), whose sum is σ = 39934944. Its totient is φ = 10459064.

The previous prime is 21869041. The next prime is 21869047. The reversal of 21869044 is 44096812.

It is an interprime number because it is at equal distance from previous prime (21869041) and next prime (21869047).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21869041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118762 + ... + 118945.

It is an arithmetic number, because the mean of its divisors is an integer number (3327912).

Almost surely, 2^21869044 is an apocalyptic number.

It is an amenable number.

21869044 is a deficient number, since it is larger than the sum of its proper divisors (18065900).

21869044 is a wasteful number, since it uses less digits than its factorization.

21869044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237734 (or 237732 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 21869044 is about 4676.4349669380. The cubic root of 21869044 is about 279.6468506969.

The spelling of 21869044 in words is "twenty-one million, eight hundred sixty-nine thousand, forty-four".