21277315 has 8 divisors (see below), whose sum is σ = 26356608. Its totient is φ = 16472640.

The previous prime is 21277301. The next prime is 21277337. The reversal of 21277315 is 51377212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21277315 - 2⁹ = 21276803 is a prime.

It is a Duffinian 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, 68482 + ... + 68791.

It is an arithmetic number, because the mean of its divisors is an integer number (3294576).

Almost surely, 2^21277315 is an apocalyptic number.

21277315 is a deficient number, since it is larger than the sum of its proper divisors (5079293).

21277315 is a wasteful number, since it uses less digits than its factorization.

21277315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137309.

The product of its digits is 2940, while the sum is 28.

The square root of 21277315 is about 4612.7340049042. The cubic root of 21277315 is about 277.1015410551.

The spelling of 21277315 in words is "twenty-one million, two hundred seventy-seven thousand, three hundred fifteen".