221121021221101 has 2 divisors, whose sum is σ = 221121021221102. Its totient is φ = 221121021221100.

The previous prime is 221121021221021. The next prime is 221121021221147. The reversal of 221121021221101 is 101122120121122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216832398552900 + 4288622668201 = 14725230^2 + 2070899^2 .

It is a cyclic number.

It is not a de Polignac number, because 221121021221101 - 2³¹ = 221118873737453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221121021225101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110560510610550 + 110560510610551.

It is an arithmetic number, because the mean of its divisors is an integer number (110560510610551).

Almost surely, 2^{221121021221101} is an apocalyptic number.

It is an amenable number.

221121021221101 is a deficient number, since it is larger than the sum of its proper divisors (1).

221121021221101 is an equidigital number, since it uses as much as digits as its factorization.

221121021221101 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 19.

Adding to 221121021221101 its reverse (101122120121122), we get a palindrome (322243141342223).

The spelling of 221121021221101 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, twenty-one million, two hundred twenty-one thousand, one hundred one".