21495873 has 32 divisors (see below), whose sum is σ = 34652160. Its totient is φ = 11592000.

The previous prime is 21495863. The next prime is 21495911. The reversal of 21495873 is 37859412.

It is not a de Polignac number, because 21495873 - 2⁵ = 21495841 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21495863) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 28248 + ... + 28998.

It is an arithmetic number, because the mean of its divisors is an integer number (1082880).

Almost surely, 2^21495873 is an apocalyptic number.

It is an amenable number.

21495873 is a deficient number, since it is larger than the sum of its proper divisors (13156287).

21495873 is a wasteful number, since it uses less digits than its factorization.

21495873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837.

The product of its digits is 60480, while the sum is 39.

The square root of 21495873 is about 4636.3642005347. The cubic root of 21495873 is about 278.0470953458.

The spelling of 21495873 in words is "twenty-one million, four hundred ninety-five thousand, eight hundred seventy-three".