2220021220121 has 4 divisors (see below), whose sum is σ = 2220111207972. Its totient is φ = 2219931232272.

The previous prime is 2220021220103. The next prime is 2220021220187. The reversal of 2220021220121 is 1210221200222.

It is a happy number.

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 1146184360000 + 1073836860121 = 1070600^2 + 1036261^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220021220121 - 2¹⁸ = 2220020957977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2220021220121.

It is not an unprimeable number, because it can be changed into a prime (2220021226121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44956910 + ... + 45006263.

It is an arithmetic number, because the mean of its divisors is an integer number (555027801993).

Almost surely, 2^{2220021220121} is an apocalyptic number.

It is an amenable number.

2220021220121 is a deficient number, since it is larger than the sum of its proper divisors (89987851).

2220021220121 is an equidigital number, since it uses as much as digits as its factorization.

2220021220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89987850.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 2220021220121 its reverse (1210221200222), we get a palindrome (3430242420343).

The spelling of 2220021220121 in words is "two trillion, two hundred twenty billion, twenty-one million, two hundred twenty thousand, one hundred twenty-one".