221021121221101 has 2 divisors, whose sum is σ = 221021121221102. Its totient is φ = 221021121221100.

The previous prime is 221021121221041. The next prime is 221021121221113. The reversal of 221021121221101 is 101122121120122.

It is a happy number.

221021121221101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189563055876100 + 31458065345001 = 13768190^2 + 5608749^2 .

It is a cyclic number.

It is not a de Polignac number, because 221021121221101 - 2²¹ = 221021119123949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221021121221171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510560610550 + 110510560610551.

It is an arithmetic number, because the mean of its divisors is an integer number (110510560610551).

Almost surely, 2^{221021121221101} is an apocalyptic number.

It is an amenable number.

221021121221101 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021121221101 is an equidigital number, since it uses as much as digits as its factorization.

221021121221101 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 221021121221101 its reverse (101122121120122), we get a palindrome (322143242341223).

The spelling of 221021121221101 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred one".