21541944 has 16 divisors (see below), whose sum is σ = 53854920. Its totient is φ = 7180640.

The previous prime is 21541939. The next prime is 21541963. The reversal of 21541944 is 44914512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 448767 + ... + 448814.

Almost surely, 2^21541944 is an apocalyptic number.

21541944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21541944 is an abundant number, since it is smaller than the sum of its proper divisors (32312976).

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

21541944 is a wasteful number, since it uses less digits than its factorization.

21541944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897590 (or 897586 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 21541944 is about 4641.3299818048. The cubic root of 21541944 is about 278.2455949524.

The spelling of 21541944 in words is "twenty-one million, five hundred forty-one thousand, nine hundred forty-four".