21295395 has 36 divisors (see below), whose sum is σ = 40583088. Its totient is φ = 10322400.

The previous prime is 21295369. The next prime is 21295399. The reversal of 21295395 is 59359212.

It is a happy number.

It is not a de Polignac number, because 21295395 - 2¹¹ = 21293347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21295399) 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 35 ways as a sum of consecutive naturals, for example, 3490 + ... + 7400.

It is an arithmetic number, because the mean of its divisors is an integer number (1127308).

Almost surely, 2^21295395 is an apocalyptic number.

21295395 is a deficient number, since it is larger than the sum of its proper divisors (19287693).

21295395 is a wasteful number, since it uses less digits than its factorization.

21295395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3944 (or 3930 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 21295395 is about 4614.6933809301. The cubic root of 21295395 is about 277.1800061165.

The spelling of 21295395 in words is "twenty-one million, two hundred ninety-five thousand, three hundred ninety-five".