222121112121 has 12 divisors (see below), whose sum is σ = 321365010148. Its totient is φ = 147839170464.

The previous prime is 222121112119. The next prime is 222121112149. The reversal of 222121112121 is 121211121222.

It can be written as a sum of positive squares in 2 ways, for example, as 34490061225 + 187631050896 = 185715^2 + 433164^2 .

It is not a de Polignac number, because 222121112121 - 2¹ = 222121112119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222121112094 and 222121112103.

It is not an unprimeable number, because it can be changed into a prime (222121110121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20125090 + ... + 20136123.

Almost surely, 2^222121112121 is an apocalyptic number.

It is an amenable number.

222121112121 is a deficient number, since it is larger than the sum of its proper divisors (99243898027).

222121112121 is a wasteful number, since it uses less digits than its factorization.

222121112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40261832 (or 40261829 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 222121112121 its reverse (121211121222), we get a palindrome (343332233343).

The spelling of 222121112121 in words is "two hundred twenty-two billion, one hundred twenty-one million, one hundred twelve thousand, one hundred twenty-one".