21225195 has 12 divisors (see below), whose sum is σ = 36790416. Its totient is φ = 11320080.

The previous prime is 21225179. The next prime is 21225203. The reversal of 21225195 is 59152212.

It is not a de Polignac number, because 21225195 - 2⁴ = 21225179 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235791 + ... + 235880.

It is an arithmetic number, because the mean of its divisors is an integer number (3065868).

Almost surely, 2^21225195 is an apocalyptic number.

21225195 is a deficient number, since it is larger than the sum of its proper divisors (15565221).

21225195 is a wasteful number, since it uses less digits than its factorization.

21225195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471682 (or 471679 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 21225195 is about 4607.0809630394. The cubic root of 21225195 is about 276.8750973678.

The spelling of 21225195 in words is "twenty-one million, two hundred twenty-five thousand, one hundred ninety-five".