2220220212121 has 4 divisors (see below), whose sum is σ = 2220466556452. Its totient is φ = 2219973867792.

The previous prime is 2220220212107. The next prime is 2220220212209. The reversal of 2220220212121 is 1212120220222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 709806250000 + 1510413962121 = 842500^2 + 1228989^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220220212121 - 2³⁹ = 1670464398233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2220220212521) 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, 123158646 + ... + 123176671.

It is an arithmetic number, because the mean of its divisors is an integer number (555116639113).

Almost surely, 2^{2220220212121} is an apocalyptic number.

It is an amenable number.

2220220212121 is a deficient number, since it is larger than the sum of its proper divisors (246344331).

2220220212121 is an equidigital number, since it uses as much as digits as its factorization.

2220220212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246344330.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 2220220212121 its reverse (1212120220222), we get a palindrome (3432340432343).

The spelling of 2220220212121 in words is "two trillion, two hundred twenty billion, two hundred twenty million, two hundred twelve thousand, one hundred twenty-one".