21211222195 has 16 divisors (see below), whose sum is σ = 26357348160. Its totient is φ = 16367553664.

The previous prime is 21211222189. The next prime is 21211222217. The reversal of 21211222195 is 59122211212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21211222195 - 2²⁷ = 21077004467 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, 74682 + ... + 219088.

It is an arithmetic number, because the mean of its divisors is an integer number (1647334260).

Almost surely, 2^21211222195 is an apocalyptic number.

21211222195 is a deficient number, since it is larger than the sum of its proper divisors (5146125965).

21211222195 is a wasteful number, since it uses less digits than its factorization.

21211222195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145454.

The product of its digits is 1440, while the sum is 28.

The spelling of 21211222195 in words is "twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, one hundred ninety-five".