21376285 has 16 divisors (see below), whose sum is σ = 29520000. Its totient is φ = 14556096.

The previous prime is 21376279. The next prime is 21376297. The reversal of 21376285 is 58267312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21376285 - 2⁵ = 21376253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21376285.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3166 + ... + 7264.

It is an arithmetic number, because the mean of its divisors is an integer number (1845000).

Almost surely, 2^21376285 is an apocalyptic number.

It is an amenable number.

21376285 is a deficient number, since it is larger than the sum of its proper divisors (8143715).

21376285 is a wasteful number, since it uses less digits than its factorization.

21376285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4260.

The product of its digits is 20160, while the sum is 34.

The square root of 21376285 is about 4623.4494698223. The cubic root of 21376285 is about 277.5305163529.

The spelling of 21376285 in words is "twenty-one million, three hundred seventy-six thousand, two hundred eighty-five".