21608195 has 16 divisors (see below), whose sum is σ = 29745408. Its totient is φ = 14761440.

The previous prime is 21608123. The next prime is 21608227. The reversal of 21608195 is 59180612.

It is not a de Polignac number, because 21608195 - 2¹⁰ = 21607171 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, 9740 + ... + 11750.

It is an arithmetic number, because the mean of its divisors is an integer number (1859088).

Almost surely, 2^21608195 is an apocalyptic number.

21608195 is a deficient number, since it is larger than the sum of its proper divisors (8137213).

21608195 is a wasteful number, since it uses less digits than its factorization.

21608195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2330.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 21608195 is about 4648.4615734671. The cubic root of 21608195 is about 278.5305457677.

The spelling of 21608195 in words is "twenty-one million, six hundred eight thousand, one hundred ninety-five".