111202020121 has 2 divisors, whose sum is σ = 111202020122. Its totient is φ = 111202020120.

The previous prime is 111202020103. The next prime is 111202020179. The reversal of 111202020121 is 121020202111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110034841225 + 1167178896 = 331715^2 + 34164^2 .

It is a cyclic number.

It is not a de Polignac number, because 111202020121 - 2¹³ = 111202011929 is a prime.

It is not a weakly prime, because it can be changed into another prime (111202020191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55601010060 + 55601010061.

It is an arithmetic number, because the mean of its divisors is an integer number (55601010061).

Almost surely, 2^111202020121 is an apocalyptic number.

It is an amenable number.

111202020121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111202020121 is an equidigital number, since it uses as much as digits as its factorization.

111202020121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 111202020121 its reverse (121020202111), we get a palindrome (232222222232).

The spelling of 111202020121 in words is "one hundred eleven billion, two hundred two million, twenty thousand, one hundred twenty-one".