100220121111221 has 2 divisors, whose sum is σ = 100220121111222. Its totient is φ = 100220121111220.

The previous prime is 100220121111203. The next prime is 100220121111233. The reversal of 100220121111221 is 122111121022001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81980602010596 + 18239519100625 = 9054314^2 + 4270775^2 .

It is a cyclic number.

It is not a de Polignac number, because 100220121111221 - 2³⁸ = 99945243204277 is a prime.

It is a super-2 number, since 2×100220121111221² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 100220121111221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100220121111281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50110060555610 + 50110060555611.

It is an arithmetic number, because the mean of its divisors is an integer number (50110060555611).

Almost surely, 2^{100220121111221} is an apocalyptic number.

It is an amenable number.

100220121111221 is a deficient number, since it is larger than the sum of its proper divisors (1).

100220121111221 is an equidigital number, since it uses as much as digits as its factorization.

100220121111221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 100220121111221 its reverse (122111121022001), we get a palindrome (222331242133222).

The spelling of 100220121111221 in words is "one hundred trillion, two hundred twenty billion, one hundred twenty-one million, one hundred eleven thousand, two hundred twenty-one".