11101220010121 has 2 divisors, whose sum is σ = 11101220010122. Its totient is φ = 11101220010120.

The previous prime is 11101220010113. The next prime is 11101220010149. The reversal of 11101220010121 is 12101002210111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9959143067721 + 1142076942400 = 3155811^2 + 1068680^2 .

It is a cyclic number.

It is not a de Polignac number, because 11101220010121 - 2³ = 11101220010113 is a prime.

It is a super-2 number, since 2×11101220010121² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11101220011121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5550610005060 + 5550610005061.

It is an arithmetic number, because the mean of its divisors is an integer number (5550610005061).

Almost surely, 2^{11101220010121} is an apocalyptic number.

It is an amenable number.

11101220010121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11101220010121 is an equidigital number, since it uses as much as digits as its factorization.

11101220010121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11101220010121 its reverse (12101002210111), we get a palindrome (23202222220232).

The spelling of 11101220010121 in words is "eleven trillion, one hundred one billion, two hundred twenty million, ten thousand, one hundred twenty-one".