2201211202121 has 4 divisors (see below), whose sum is σ = 2201214439812. Its totient is φ = 2201207964432.

The previous prime is 2201211202093. The next prime is 2201211202139. The reversal of 2201211202121 is 1212021121022.

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 1337168449600 + 864042752521 = 1156360^2 + 929539^2 .

It is a cyclic number.

It is not a de Polignac number, because 2201211202121 - 2²⁶ = 2201144093257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2201211202121.

It is not an unprimeable number, because it can be changed into a prime (2201211201121) 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, 162050 + ... + 2104443.

It is an arithmetic number, because the mean of its divisors is an integer number (550303609953).

Almost surely, 2^{2201211202121} is an apocalyptic number.

It is an amenable number.

2201211202121 is a deficient number, since it is larger than the sum of its proper divisors (3237691).

2201211202121 is an equidigital number, since it uses as much as digits as its factorization.

2201211202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3237690.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2201211202121 its reverse (1212021121022), we get a palindrome (3413232323143).

The spelling of 2201211202121 in words is "two trillion, two hundred one billion, two hundred eleven million, two hundred two thousand, one hundred twenty-one".