2221020000121 has 4 divisors (see below), whose sum is σ = 2391867692452. Its totient is φ = 2050172307792.

The previous prime is 2221020000109. The next prime is 2221020000161. The reversal of 2221020000121 is 1210000201222.

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 398962773225 + 1822057226896 = 631635^2 + 1349836^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221020000121 - 2⁷ = 2221019999993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 170847692317 = 2221020000121 / (2 + 2 + 2 + 1 + 0 + 2 + 0 + 0 + 0 + 0 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221020000161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85423846146 + ... + 85423846171.

It is an arithmetic number, because the mean of its divisors is an integer number (597966923113).

Almost surely, 2^{2221020000121} is an apocalyptic number.

It is an amenable number.

2221020000121 is a deficient number, since it is larger than the sum of its proper divisors (170847692331).

2221020000121 is a wasteful number, since it uses less digits than its factorization.

2221020000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170847692330.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2221020000121 its reverse (1210000201222), we get a palindrome (3431020201343).

The spelling of 2221020000121 in words is "two trillion, two hundred twenty-one billion, twenty million, one hundred twenty-one", and thus it is an aban number.