21046944 has 48 divisors (see below), whose sum is σ = 55520640. Its totient is φ = 6981120.

The previous prime is 21046939. The next prime is 21046951. The reversal of 21046944 is 44964012.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25612 + ... + 26420.

It is an arithmetic number, because the mean of its divisors is an integer number (1156680).

Almost surely, 2^21046944 is an apocalyptic number.

21046944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21046944 is an abundant number, since it is smaller than the sum of its proper divisors (34473696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21046944 is a wasteful number, since it uses less digits than its factorization.

21046944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093 (or 1085 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 21046944 is about 4587.6948459984. The cubic root of 21046944 is about 276.0978439065.

The spelling of 21046944 in words is "twenty-one million, forty-six thousand, nine hundred forty-four".