121202202221 has 4 divisors (see below), whose sum is σ = 121203831132. Its totient is φ = 121200573312.

The previous prime is 121202202211. The next prime is 121202202271. The reversal of 121202202221 is 122202202121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122202202121 = 113 ⋅1081435417.

It can be written as a sum of positive squares in 2 ways, for example, as 10320528100 + 110881674121 = 101590^2 + 332989^2 .

It is a cyclic number.

It is not a de Polignac number, because 121202202221 - 2¹⁴ = 121202185837 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 121202202221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121202202211) 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, 697220 + ... + 853533.

It is an arithmetic number, because the mean of its divisors is an integer number (30300957783).

Almost surely, 2^121202202221 is an apocalyptic number.

It is an amenable number.

121202202221 is a deficient number, since it is larger than the sum of its proper divisors (1628911).

121202202221 is an equidigital number, since it uses as much as digits as its factorization.

121202202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628910.

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

Adding to 121202202221 its reverse (122202202121), we get a palindrome (243404404342).

The spelling of 121202202221 in words is "one hundred twenty-one billion, two hundred two million, two hundred two thousand, two hundred twenty-one".