21860744 has 8 divisors (see below), whose sum is σ = 40988910. Its totient is φ = 10930368.

The previous prime is 21860731. The next prime is 21860771. The reversal of 21860744 is 44706812.

It can be written as a sum of positive squares in only one way, i.e., 14364100 + 7496644 = 3790^2 + 2738^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21860744.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1366289 + ... + 1366304.

Almost surely, 2^21860744 is an apocalyptic number.

It is an amenable number.

21860744 is a deficient number, since it is larger than the sum of its proper divisors (19128166).

21860744 is a wasteful number, since it uses less digits than its factorization.

21860744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2732599 (or 2732595 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 21860744 is about 4675.5474545768. The cubic root of 21860744 is about 279.6114679193.

The spelling of 21860744 in words is "twenty-one million, eight hundred sixty thousand, seven hundred forty-four".