21376404 has 36 divisors (see below), whose sum is σ = 61754784. Its totient is φ = 6107472.

The previous prime is 21376403. The next prime is 21376409. The reversal of 21376404 is 40467312.

21376404 is a `hidden beast` number, since 2 + 13 + 7 + 640 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21376403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42162 + ... + 42665.

Almost surely, 2^21376404 is an apocalyptic number.

It is an amenable number.

21376404 is an abundant number, since it is smaller than the sum of its proper divisors (40378380).

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

21376404 is a wasteful number, since it uses less digits than its factorization.

21376404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84844 (or 84839 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 21376404 is about 4623.4623389836. The cubic root of 21376404 is about 277.5310313484.

The spelling of 21376404 in words is "twenty-one million, three hundred seventy-six thousand, four hundred four".