21211222193 has 4 divisors (see below), whose sum is σ = 24241396800. Its totient is φ = 18181047588.

The previous prime is 21211222189. The next prime is 21211222217. The reversal of 21211222193 is 39122211212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21211222193 - 2² = 21211222189 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211222103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515087293 + ... + 1515087306.

It is an arithmetic number, because the mean of its divisors is an integer number (6060349200).

Almost surely, 2^21211222193 is an apocalyptic number.

It is an amenable number.

21211222193 is a deficient number, since it is larger than the sum of its proper divisors (3030174607).

21211222193 is an equidigital number, since it uses as much as digits as its factorization.

21211222193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030174606.

The product of its digits is 864, while the sum is 26.

The spelling of 21211222193 in words is "twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, one hundred ninety-three".