21973115 has 8 divisors (see below), whose sum is σ = 26800368. Its totient is φ = 17290080.

The previous prime is 21973103. The next prime is 21973157. The reversal of 21973115 is 51137912.

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

It is not a de Polignac number, because 21973115 - 2⁴ = 21973099 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, 35717 + ... + 36326.

It is an arithmetic number, because the mean of its divisors is an integer number (3350046).

Almost surely, 2^21973115 is an apocalyptic number.

21973115 is a deficient number, since it is larger than the sum of its proper divisors (4827253).

21973115 is an equidigital number, since it uses as much as digits as its factorization.

21973115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72109.

The product of its digits is 1890, while the sum is 29.

The square root of 21973115 is about 4687.5489330779. The cubic root of 21973115 is about 280.0897458913.

The spelling of 21973115 in words is "twenty-one million, nine hundred seventy-three thousand, one hundred fifteen".