21025304395 has 4 divisors (see below), whose sum is σ = 25230365280. Its totient is φ = 16820243512.

The previous prime is 21025304389. The next prime is 21025304401. The reversal of 21025304395 is 59340352012.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21025304389) and next prime (21025304401).

It is a cyclic number.

It is not a de Polignac number, because 21025304395 - 2⁹ = 21025303883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21025304395.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2102530435 + ... + 2102530444.

It is an arithmetic number, because the mean of its divisors is an integer number (6307591320).

Almost surely, 2^21025304395 is an apocalyptic number.

21025304395 is a deficient number, since it is larger than the sum of its proper divisors (4205060885).

21025304395 is an equidigital number, since it uses as much as digits as its factorization.

21025304395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4205060884.

The product of its (nonzero) digits is 32400, while the sum is 34.

The spelling of 21025304395 in words is "twenty-one billion, twenty-five million, three hundred four thousand, three hundred ninety-five".