21030395 has 12 divisors (see below), whose sum is σ = 26384736. Its totient is φ = 16090800.

The previous prime is 21030389. The next prime is 21030403. The reversal of 21030395 is 59303012.

21030395 = T₇₄₆ + T₇₄₇ + ... + T₈₁₄.

It is a happy number.

It is not a de Polignac number, because 21030395 - 2⁴ = 21030379 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21030395.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1331 + ... + 6620.

It is an arithmetic number, because the mean of its divisors is an integer number (2198728).

Almost surely, 2^21030395 is an apocalyptic number.

21030395 is a deficient number, since it is larger than the sum of its proper divisors (5354341).

21030395 is an equidigital number, since it uses as much as digits as its factorization.

21030395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8002 (or 7979 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 21030395 is about 4585.8908621990. The cubic root of 21030395 is about 276.0254606142.

The spelling of 21030395 in words is "twenty-one million, thirty thousand, three hundred ninety-five".