111202211221121 has 2 divisors, whose sum is σ = 111202211221122. Its totient is φ = 111202211221120.

The previous prime is 111202211221111. The next prime is 111202211221151. The reversal of 111202211221121 is 121122112202111.

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., 65916861966400 + 45285349254721 = 8118920^2 + 6729439^2 .

It is an emirp because it is prime and its reverse (121122112202111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111202211221121 - 2³⁴ = 111185031351937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111202211221093 and 111202211221102.

It is not a weakly prime, because it can be changed into another prime (111202211221111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55601105610560 + 55601105610561.

It is an arithmetic number, because the mean of its divisors is an integer number (55601105610561).

Almost surely, 2^{111202211221121} is an apocalyptic number.

It is an amenable number.

111202211221121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111202211221121 is an equidigital number, since it uses as much as digits as its factorization.

111202211221121 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 20.

Adding to 111202211221121 its reverse (121122112202111), we get a palindrome (232324323423232).

The spelling of 111202211221121 in words is "one hundred eleven trillion, two hundred two billion, two hundred eleven million, two hundred twenty-one thousand, one hundred twenty-one".