21145295 has 4 divisors (see below), whose sum is σ = 25374360. Its totient is φ = 16916232.

The previous prime is 21145261. The next prime is 21145301. The reversal of 21145295 is 59254112.

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

It is a cyclic number.

It is not a de Polignac number, because 21145295 - 2²⁴ = 4368079 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2114525 + ... + 2114534.

It is an arithmetic number, because the mean of its divisors is an integer number (6343590).

Almost surely, 2^21145295 is an apocalyptic number.

21145295 is a deficient number, since it is larger than the sum of its proper divisors (4229065).

21145295 is an equidigital number, since it uses as much as digits as its factorization.

21145295 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4229064.

The product of its digits is 3600, while the sum is 29.

The square root of 21145295 is about 4598.4013526442. The cubic root of 21145295 is about 276.5272381762.

The spelling of 21145295 in words is "twenty-one million, one hundred forty-five thousand, two hundred ninety-five".