21625544 has 8 divisors (see below), whose sum is σ = 40547910. Its totient is φ = 10812768.

The previous prime is 21625531. The next prime is 21625559. The reversal of 21625544 is 44552612.

It can be written as a sum of positive squares in only one way, i.e., 19909444 + 1716100 = 4462^2 + 1310^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1351589 + ... + 1351604.

Almost surely, 2^21625544 is an apocalyptic number.

It is an amenable number.

21625544 is a deficient number, since it is larger than the sum of its proper divisors (18922366).

21625544 is a wasteful number, since it uses less digits than its factorization.

21625544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2703199 (or 2703195 counting only the distinct ones).

The product of its digits is 9600, while the sum is 29.

The square root of 21625544 is about 4650.3273003091. The cubic root of 21625544 is about 278.6050689408.

The spelling of 21625544 in words is "twenty-one million, six hundred twenty-five thousand, five hundred forty-four".