21049544 has 16 divisors (see below), whose sum is σ = 39553920. Its totient is φ = 10501840.

The previous prime is 21049543. The next prime is 21049573. The reversal of 21049544 is 44594012.

It is not an unprimeable number, because it can be changed into a prime (21049541) 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, 1409 + ... + 6639.

It is an arithmetic number, because the mean of its divisors is an integer number (2472120).

Almost surely, 2^21049544 is an apocalyptic number.

It is an amenable number.

21049544 is a deficient number, since it is larger than the sum of its proper divisors (18504376).

21049544 is a wasteful number, since it uses less digits than its factorization.

21049544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5740 (or 5736 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 21049544 is about 4587.9782039587. The cubic root of 21049544 is about 276.1092125378.

The spelling of 21049544 in words is "twenty-one million, forty-nine thousand, five hundred forty-four".