21408195 has 16 divisors (see below), whose sum is σ = 35050752. Its totient is φ = 11151840.

The previous prime is 21408181. The next prime is 21408227. The reversal of 21408195 is 59180412.

It is a happy number.

It is not a de Polignac number, because 21408195 - 2⁷ = 21408067 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15951 + ... + 17240.

It is an arithmetic number, because the mean of its divisors is an integer number (2190672).

Almost surely, 2^21408195 is an apocalyptic number.

21408195 is a deficient number, since it is larger than the sum of its proper divisors (13642557).

21408195 is a wasteful number, since it uses less digits than its factorization.

21408195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33242.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 21408195 is about 4626.8990695713. The cubic root of 21408195 is about 277.6685446361.

The spelling of 21408195 in words is "twenty-one million, four hundred eight thousand, one hundred ninety-five".