21376005 has 48 divisors (see below), whose sum is σ = 40273920. Its totient is φ = 9652608.

The previous prime is 21375971. The next prime is 21376009. The reversal of 21376005 is 50067312.

It is not a de Polignac number, because 21376005 - 2⁹ = 21375493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21376009) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 93231 + ... + 93459.

It is an arithmetic number, because the mean of its divisors is an integer number (839040).

Almost surely, 2^21376005 is an apocalyptic number.

It is an amenable number.

21376005 is a deficient number, since it is larger than the sum of its proper divisors (18897915).

21376005 is a wasteful number, since it uses less digits than its factorization.

21376005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 21376005 is about 4623.4191893014. The cubic root of 21376005 is about 277.5293045913.

The spelling of 21376005 in words is "twenty-one million, three hundred seventy-six thousand, five".