221002222201021 has 2 divisors, whose sum is σ = 221002222201022. Its totient is φ = 221002222201020.

The previous prime is 221002222201001. The next prime is 221002222201037. The reversal of 221002222201021 is 120102222200122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218235206201796 + 2767015999225 = 14772786^2 + 1663435^2 .

It is a cyclic number.

It is not a de Polignac number, because 221002222201021 - 2⁵ = 221002222200989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221002222201021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221002222201001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110501111100510 + 110501111100511.

It is an arithmetic number, because the mean of its divisors is an integer number (110501111100511).

Almost surely, 2^{221002222201021} is an apocalyptic number.

It is an amenable number.

221002222201021 is a deficient number, since it is larger than the sum of its proper divisors (1).

221002222201021 is an equidigital number, since it uses as much as digits as its factorization.

221002222201021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221002222201021 its reverse (120102222200122), we get a palindrome (341104444401143).

The spelling of 221002222201021 in words is "two hundred twenty-one trillion, two billion, two hundred twenty-two million, two hundred one thousand, twenty-one".