2221001122122 has 48 divisors (see below), whose sum is σ = 4825909888488. Its totient is φ = 738222698880.

The previous prime is 2221001122111. The next prime is 2221001122129. The reversal of 2221001122122 is 2212211001222.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 478973342241 + 1742027779881 = 692079^2 + 1319859^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 2221001122095 and 2221001122104.

It is not an unprimeable number, because it can be changed into a prime (2221001122129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8936328 + ... + 9181500.

Almost surely, 2^{2221001122122} is an apocalyptic number.

2221001122122 is an abundant number, since it is smaller than the sum of its proper divisors (2604908766366).

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

2221001122122 is a wasteful number, since it uses less digits than its factorization.

2221001122122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246615 (or 246612 counting only the distinct ones).

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

Adding to 2221001122122 its reverse (2212211001222), we get a palindrome (4433212123344).

The spelling of 2221001122122 in words is "two trillion, two hundred twenty-one billion, one million, one hundred twenty-two thousand, one hundred twenty-two".