21082895 has 4 divisors (see below), whose sum is σ = 25299480. Its totient is φ = 16866312.

The previous prime is 21082879. The next prime is 21082903. The reversal of 21082895 is 59828012.

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 21082895 - 2⁴ = 21082879 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2108285 + ... + 2108294.

It is an arithmetic number, because the mean of its divisors is an integer number (6324870).

Almost surely, 2^21082895 is an apocalyptic number.

21082895 is a deficient number, since it is larger than the sum of its proper divisors (4216585).

21082895 is an equidigital number, since it uses as much as digits as its factorization.

21082895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4216584.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 21082895 is about 4591.6113729278. The cubic root of 21082895 is about 276.2549585182.

It can be divided in two parts, 210 and 82895, that multiplied together give a triangular number (17407950 = T₅₉₀₀).

The spelling of 21082895 in words is "twenty-one million, eighty-two thousand, eight hundred ninety-five".