21025395 has 24 divisors (see below), whose sum is σ = 36550800. Its totient is φ = 11180736.

The previous prime is 21025363. The next prime is 21025397. The reversal of 21025395 is 59352012.

It is not a de Polignac number, because 21025395 - 2⁵ = 21025363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21025397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29301 + ... + 30009.

It is an arithmetic number, because the mean of its divisors is an integer number (1522950).

Almost surely, 2^21025395 is an apocalyptic number.

21025395 is a deficient number, since it is larger than the sum of its proper divisors (15525405).

21025395 is a wasteful number, since it uses less digits than its factorization.

21025395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379 (or 1376 counting only the distinct ones).

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

The square root of 21025395 is about 4585.3456794445. The cubic root of 21025395 is about 276.0035837594.

The spelling of 21025395 in words is "twenty-one million, twenty-five thousand, three hundred ninety-five".