21059144 has 16 divisors (see below), whose sum is σ = 41564400. Its totient is φ = 9975312.

The previous prime is 21059119. The next prime is 21059161. The reversal of 21059144 is 44195012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69122 + ... + 69425.

It is an arithmetic number, because the mean of its divisors is an integer number (2597775).

Almost surely, 2^21059144 is an apocalyptic number.

It is an amenable number.

21059144 is a deficient number, since it is larger than the sum of its proper divisors (20505256).

21059144 is a wasteful number, since it uses less digits than its factorization.

21059144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138572 (or 138568 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 21059144 is about 4589.0242971682. The cubic root of 21059144 is about 276.1511809146.

The spelling of 21059144 in words is "twenty-one million, fifty-nine thousand, one hundred forty-four".