21495876 has 12 divisors (see below), whose sum is σ = 50157072. Its totient is φ = 7165288.

The previous prime is 21495863. The next prime is 21495911. The reversal of 21495876 is 67859412.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 895650 + ... + 895673.

It is an arithmetic number, because the mean of its divisors is an integer number (4179756).

Almost surely, 2^21495876 is an apocalyptic number.

It is an amenable number.

21495876 is an abundant number, since it is smaller than the sum of its proper divisors (28661196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21495876 is a wasteful number, since it uses less digits than its factorization.

21495876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1791330 (or 1791328 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The square root of 21495876 is about 4636.3645240641. The cubic root of 21495876 is about 278.0471082807.

The spelling of 21495876 in words is "twenty-one million, four hundred ninety-five thousand, eight hundred seventy-six".