2222220212121 has 64 divisors (see below), whose sum is σ = 3753819238400. Its totient is φ = 1137879933696.

The previous prime is 2222220212083. The next prime is 2222220212159. The reversal of 2222220212121 is 1212120222222.

2222220212121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2222220212083) and next prime (2222220212159).

It is not a de Polignac number, because 2222220212121 - 2³⁴ = 2205040342937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (2222220211121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4183770 + ... + 4684908.

It is an arithmetic number, because the mean of its divisors is an integer number (58653425600).

Almost surely, 2^{2222220212121} is an apocalyptic number.

2222220212121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2222220212121 is a deficient number, since it is larger than the sum of its proper divisors (1531599026279).

2222220212121 is a wasteful number, since it uses less digits than its factorization.

2222220212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501638.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 2222220212121 its reverse (1212120222222), we get a palindrome (3434340434343).

The spelling of 2222220212121 in words is "two trillion, two hundred twenty-two billion, two hundred twenty million, two hundred twelve thousand, one hundred twenty-one".