21148315 has 8 divisors (see below), whose sum is σ = 25549200. Its totient is φ = 16804512.

The previous prime is 21148297. The next prime is 21148321. The reversal of 21148315 is 51384112.

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

It is a cyclic number.

It is not a de Polignac number, because 21148315 - 2⁹ = 21147803 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21148315.

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, 13449 + ... + 14938.

It is an arithmetic number, because the mean of its divisors is an integer number (3193650).

Almost surely, 2^21148315 is an apocalyptic number.

21148315 is a deficient number, since it is larger than the sum of its proper divisors (4400885).

21148315 is a wasteful number, since it uses less digits than its factorization.

21148315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28541.

The product of its digits is 960, while the sum is 25.

The square root of 21148315 is about 4598.7297159107. The cubic root of 21148315 is about 276.5404022158.

The spelling of 21148315 in words is "twenty-one million, one hundred forty-eight thousand, three hundred fifteen".