21860937 has 24 divisors (see below), whose sum is σ = 36226944. Its totient is φ = 12443904.

The previous prime is 21860933. The next prime is 21860939. The reversal of 21860937 is 73906812.

21860937 is a `hidden beast` number, since 2 + 18 + 609 + 37 = 666.

It is not a de Polignac number, because 21860937 - 2² = 21860933 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21860933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21748 + ... + 22730.

It is an arithmetic number, because the mean of its divisors is an integer number (1509456).

Almost surely, 2^21860937 is an apocalyptic number.

It is an amenable number.

21860937 is a deficient number, since it is larger than the sum of its proper divisors (14366007).

21860937 is a wasteful number, since it uses less digits than its factorization.

21860937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349 (or 1346 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 21860937 is about 4675.5680938256. The cubic root of 21860937 is about 279.6122907772.

The spelling of 21860937 in words is "twenty-one million, eight hundred sixty thousand, nine hundred thirty-seven".