21761404 has 24 divisors (see below), whose sum is σ = 45416448. Its totient is φ = 8920560.

The previous prime is 21761393. The next prime is 21761431. The reversal of 21761404 is 40416712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16252 + ... + 17539.

It is an arithmetic number, because the mean of its divisors is an integer number (1892352).

Almost surely, 2^21761404 is an apocalyptic number.

It is an amenable number.

21761404 is an abundant number, since it is smaller than the sum of its proper divisors (23655044).

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

21761404 is a wasteful number, since it uses less digits than its factorization.

21761404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33825 (or 33823 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 21761404 is about 4664.9120034573. The cubic root of 21761404 is about 279.1872861976.

The spelling of 21761404 in words is "twenty-one million, seven hundred sixty-one thousand, four hundred four".