21401944 has 16 divisors (see below), whose sum is σ = 40728600. Its totient is φ = 10540992.

The previous prime is 21401927. The next prime is 21401951. The reversal of 21401944 is 44910412.

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, 19429 + ... + 20500.

Almost surely, 2^21401944 is an apocalyptic number.

It is an amenable number.

21401944 is a deficient number, since it is larger than the sum of its proper divisors (19326656).

21401944 is a wasteful number, since it uses less digits than its factorization.

21401944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40002 (or 39998 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 21401944 is about 4626.2235138393. The cubic root of 21401944 is about 277.6415164344.

The spelling of 21401944 in words is "twenty-one million, four hundred one thousand, nine hundred forty-four".