21254315 has 8 divisors (see below), whose sum is σ = 25855008. Its totient is φ = 16770240.

The previous prime is 21254309. The next prime is 21254327. The reversal of 21254315 is 51345212.

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

It is not a de Polignac number, because 21254315 - 2²⁰ = 20205739 is a prime.

It is a super-2 number, since 2×21254315² = 903491812238450, which contains 22 as substring.

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, 28751 + ... + 29480.

It is an arithmetic number, because the mean of its divisors is an integer number (3231876).

Almost surely, 2^21254315 is an apocalyptic number.

21254315 is a deficient number, since it is larger than the sum of its proper divisors (4600693).

21254315 is an equidigital number, since it uses as much as digits as its factorization.

21254315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58309.

The product of its digits is 1200, while the sum is 23.

The square root of 21254315 is about 4610.2402323523. The cubic root of 21254315 is about 277.0016595104.

Adding to 21254315 its reverse (51345212), we get a palindrome (72599527).

The spelling of 21254315 in words is "twenty-one million, two hundred fifty-four thousand, three hundred fifteen".