21473115 has 16 divisors (see below), whose sum is σ = 34476288. Its totient is φ = 11412576.

The previous prime is 21473107. The next prime is 21473147. The reversal of 21473115 is 51137412.

It is not a de Polignac number, because 21473115 - 2³ = 21473107 is a prime.

It is a super-2 number, since 2×21473115² = 922189335606450, which contains 22 as substring.

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, 2274 + ... + 6936.

It is an arithmetic number, because the mean of its divisors is an integer number (2154768).

Almost surely, 2^21473115 is an apocalyptic number.

21473115 is a deficient number, since it is larger than the sum of its proper divisors (13003173).

21473115 is a wasteful number, since it uses less digits than its factorization.

21473115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4978.

The product of its digits is 840, while the sum is 24.

The square root of 21473115 is about 4633.9092567723. The cubic root of 21473115 is about 277.9489365004.

The spelling of 21473115 in words is "twenty-one million, four hundred seventy-three thousand, one hundred fifteen".