21222222194 has 8 divisors (see below), whose sum is σ = 31840347888. Its totient is φ = 10608772900.

The previous prime is 21222222181. The next prime is 21222222209. The reversal of 21222222194 is 49122222212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1157732 + ... + 1175919.

It is an arithmetic number, because the mean of its divisors is an integer number (3980043486).

Almost surely, 2^21222222194 is an apocalyptic number.

21222222194 is a deficient number, since it is larger than the sum of its proper divisors (10618125694).

21222222194 is a wasteful number, since it uses less digits than its factorization.

21222222194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338200.

The product of its digits is 4608, while the sum is 29.

The spelling of 21222222194 in words is "twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred ninety-four".