21487295 has 8 divisors (see below), whose sum is σ = 25894080. Its totient is φ = 17116960.

The previous prime is 21487283. The next prime is 21487307. The reversal of 21487295 is 59278412.

It is an interprime number because it is at equal distance from previous prime (21487283) and next prime (21487307).

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

It is a de Polignac number, because none of the positive numbers 2^k-21487295 is a prime.

It is a congruent 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, 7796 + ... + 10185.

It is an arithmetic number, because the mean of its divisors is an integer number (3236760).

Almost surely, 2^21487295 is an apocalyptic number.

21487295 is a deficient number, since it is larger than the sum of its proper divisors (4406785).

21487295 is a wasteful number, since it uses less digits than its factorization.

21487295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18225.

The product of its digits is 40320, while the sum is 38.

The square root of 21487295 is about 4635.4390299086. The cubic root of 21487295 is about 278.0101052173.

The spelling of 21487295 in words is "twenty-one million, four hundred eighty-seven thousand, two hundred ninety-five".