21640095 has 32 divisors (see below), whose sum is σ = 38754240. Its totient is φ = 11456640.

The previous prime is 21640081. The next prime is 21640121. The reversal of 21640095 is 59004612.

It is not a de Polignac number, because 21640095 - 2⁵ = 21640063 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20685 + ... + 21705.

It is an arithmetic number, because the mean of its divisors is an integer number (1211070).

Almost surely, 2^21640095 is an apocalyptic number.

21640095 is a deficient number, since it is larger than the sum of its proper divisors (17114145).

21640095 is a wasteful number, since it uses less digits than its factorization.

21640095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192 (or 1186 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 21640095 is about 4651.8915507565. The cubic root of 21640095 is about 278.6675424897.

The spelling of 21640095 in words is "twenty-one million, six hundred forty thousand, ninety-five".