21116315 has 32 divisors (see below), whose sum is σ = 29514240. Its totient is φ = 14461920.

The previous prime is 21116299. The next prime is 21116317. The reversal of 21116315 is 51361112.

It is not a de Polignac number, because 21116315 - 2⁴ = 21116299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21116317) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126362 + ... + 126528.

It is an arithmetic number, because the mean of its divisors is an integer number (922320).

Almost surely, 2^21116315 is an apocalyptic number.

21116315 is a deficient number, since it is larger than the sum of its proper divisors (8397925).

21116315 is a wasteful number, since it uses less digits than its factorization.

21116315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 202 counting only the distinct ones).

The product of its digits is 180, while the sum is 20.

The square root of 21116315 is about 4595.2491771394. The cubic root of 21116315 is about 276.4008519335.

Adding to 21116315 its reverse (51361112), we get a palindrome (72477427).

The spelling of 21116315 in words is "twenty-one million, one hundred sixteen thousand, three hundred fifteen".