111221021112121 has 2 divisors, whose sum is σ = 111221021112122. Its totient is φ = 111221021112120.

The previous prime is 111221021112107. The next prime is 111221021112151. The reversal of 111221021112121 is 121211120122111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72009141072400 + 39211880039721 = 8485820^2 + 6261939^2 .

It is a cyclic number.

It is not a de Polignac number, because 111221021112121 - 2²⁷ = 111220886894393 is a prime.

It is not a weakly prime, because it can be changed into another prime (111221021112101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610510556060 + 55610510556061.

It is an arithmetic number, because the mean of its divisors is an integer number (55610510556061).

Almost surely, 2^{111221021112121} is an apocalyptic number.

It is an amenable number.

111221021112121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221021112121 is an equidigital number, since it uses as much as digits as its factorization.

111221021112121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 111221021112121 its reverse (121211120122111), we get a palindrome (232432141234232).

The spelling of 111221021112121 in words is "one hundred eleven trillion, two hundred twenty-one billion, twenty-one million, one hundred twelve thousand, one hundred twenty-one".