21046444 has 6 divisors (see below), whose sum is σ = 36831284. Its totient is φ = 10523220.

The previous prime is 21046429. The next prime is 21046447. The reversal of 21046444 is 44464012.

It is not an unprimeable number, because it can be changed into a prime (21046447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2630802 + ... + 2630809.

Almost surely, 2^21046444 is an apocalyptic number.

It is an amenable number.

21046444 is a deficient number, since it is larger than the sum of its proper divisors (15784840).

21046444 is a wasteful number, since it uses less digits than its factorization.

21046444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5261615 (or 5261613 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 21046444 is about 4587.6403520764. The cubic root of 21046444 is about 276.0956575239.

The spelling of 21046444 in words is "twenty-one million, forty-six thousand, four hundred forty-four".