21046895 has 16 divisors (see below), whose sum is σ = 26840160. Its totient is φ = 15813504.

The previous prime is 21046877. The next prime is 21046897. The reversal of 21046895 is 59864012.

It is not a de Polignac number, because 21046895 - 2⁸ = 21046639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21046897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3404 + ... + 7326.

It is an arithmetic number, because the mean of its divisors is an integer number (1677510).

Almost surely, 2^21046895 is an apocalyptic number.

21046895 is a deficient number, since it is larger than the sum of its proper divisors (5793265).

21046895 is a wasteful number, since it uses less digits than its factorization.

21046895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3994.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 21046895 is about 4587.6895056226. The cubic root of 21046895 is about 276.0976296425.

The spelling of 21046895 in words is "twenty-one million, forty-six thousand, eight hundred ninety-five".