10202121102221 has 4 divisors (see below), whose sum is σ = 10204379712252. Its totient is φ = 10199862492192.

The previous prime is 10202121102211. The next prime is 10202121102247. The reversal of 10202121102221 is 12220112120201.

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 1859988626596 + 8342132475625 = 1363814^2 + 2888275^2 .

It is a cyclic number.

It is not a de Polignac number, because 10202121102221 - 2¹⁸ = 10202120840077 is a prime.

It is a super-2 number, since 2×10202121102221² (a number of 27 digits) contains 22 as substring.

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 10202121102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10202121102211) 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, 1129298240 + ... + 1129307273.

It is an arithmetic number, because the mean of its divisors is an integer number (2551094928063).

Almost surely, 2^{10202121102221} is an apocalyptic number.

It is an amenable number.

10202121102221 is a deficient number, since it is larger than the sum of its proper divisors (2258610031).

10202121102221 is an equidigital number, since it uses as much as digits as its factorization.

10202121102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2258610030.

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

Adding to 10202121102221 its reverse (12220112120201), we get a palindrome (22422233222422).

The spelling of 10202121102221 in words is "ten trillion, two hundred two billion, one hundred twenty-one million, one hundred two thousand, two hundred twenty-one".