21222211122 has 48 divisors (see below), whose sum is σ = 53290403712. Its totient is φ = 5978085120.

The previous prime is 21222211111. The next prime is 21222211151. The reversal of 21222211122 is 22111222212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21222211095 and 21222211104.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1177183 + ... + 1195074.

It is an arithmetic number, because the mean of its divisors is an integer number (1110216744).

Almost surely, 2^21222211122 is an apocalyptic number.

21222211122 is an abundant number, since it is smaller than the sum of its proper divisors (32068192590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21222211122 is a wasteful number, since it uses less digits than its factorization.

21222211122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2372343 (or 2372340 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

Adding to 21222211122 its reverse (22111222212), we get a palindrome (43333433334).

The spelling of 21222211122 in words is "twenty-one billion, two hundred twenty-two million, two hundred eleven thousand, one hundred twenty-two".