21444885 has 64 divisors (see below), whose sum is σ = 47554560. Its totient is φ = 8907840.

The previous prime is 21444877. The next prime is 21444893. The reversal of 21444885 is 58844412.

It is an interprime number because it is at equal distance from previous prime (21444877) and next prime (21444893).

It is not a de Polignac number, because 21444885 - 2³ = 21444877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9364 + ... + 11426.

It is an arithmetic number, because the mean of its divisors is an integer number (743040).

Almost surely, 2^21444885 is an apocalyptic number.

It is an amenable number.

21444885 is an abundant number, since it is smaller than the sum of its proper divisors (26109675).

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

21444885 is a wasteful number, since it uses less digits than its factorization.

21444885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2095 (or 2089 counting only the distinct ones).

The product of its digits is 40960, while the sum is 36.

The square root of 21444885 is about 4630.8622307298. The cubic root of 21444885 is about 277.8270796342.

The spelling of 21444885 in words is "twenty-one million, four hundred forty-four thousand, eight hundred eighty-five".