220111002021221 has 2 divisors, whose sum is σ = 220111002021222. Its totient is φ = 220111002021220.

The previous prime is 220111002021217. The next prime is 220111002021247. The reversal of 220111002021221 is 122120200111022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190098299812996 + 30012702208225 = 13787614^2 + 5478385^2 .

It is a cyclic number.

It is not a de Polignac number, because 220111002021221 - 2² = 220111002021217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220111002021221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220111002021271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110055501010610 + 110055501010611.

It is an arithmetic number, because the mean of its divisors is an integer number (110055501010611).

Almost surely, 2^{220111002021221} is an apocalyptic number.

It is an amenable number.

220111002021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

220111002021221 is an equidigital number, since it uses as much as digits as its factorization.

220111002021221 is an evil number, because the sum of its binary digits is even.

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

Adding to 220111002021221 its reverse (122120200111022), we get a palindrome (342231202132243).

The spelling of 220111002021221 in words is "two hundred twenty trillion, one hundred eleven billion, two million, twenty-one thousand, two hundred twenty-one".