21052395 has 96 divisors (see below), whose sum is σ = 46230912. Its totient is φ = 8626176.

The previous prime is 21052391. The next prime is 21052411. The reversal of 21052395 is 59325012.

It is not a de Polignac number, because 21052395 - 2² = 21052391 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21052391) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 216987 + ... + 217083.

It is an arithmetic number, because the mean of its divisors is an integer number (481572).

Almost surely, 2^21052395 is an apocalyptic number.

21052395 is an abundant number, since it is smaller than the sum of its proper divisors (25178517).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21052395 is a wasteful number, since it uses less digits than its factorization.

21052395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 21052395 is about 4588.2888967457. The cubic root of 21052395 is about 276.1216776032.

The spelling of 21052395 in words is "twenty-one million, fifty-two thousand, three hundred ninety-five".