21473044 has 6 divisors (see below), whose sum is σ = 37577834. Its totient is φ = 10736520.

The previous prime is 21473041. The next prime is 21473071. The reversal of 21473044 is 44037412.

It can be written as a sum of positive squares in only one way, i.e., 21270544 + 202500 = 4612^2 + 450^2 .

It is a super-2 number, since 2×21473044² = 922183237251872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21473041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2684127 + ... + 2684134.

Almost surely, 2^21473044 is an apocalyptic number.

It is an amenable number.

21473044 is a deficient number, since it is larger than the sum of its proper divisors (16104790).

21473044 is a wasteful number, since it uses less digits than its factorization.

21473044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5368265 (or 5368263 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 21473044 is about 4633.9015958477. The cubic root of 21473044 is about 277.9486301577.

The spelling of 21473044 in words is "twenty-one million, four hundred seventy-three thousand, forty-four".