121222211122021 has 2 divisors, whose sum is σ = 121222211122022. Its totient is φ = 121222211122020.

The previous prime is 121222211121989. The next prime is 121222211122091. The reversal of 121222211122021 is 120221112222121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85429093041796 + 35793118080225 = 9242786^2 + 5982735^2 .

It is a cyclic number.

It is not a de Polignac number, because 121222211122021 - 2⁵ = 121222211121989 is a prime.

It is a super-2 number, since 2×121222211122021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121222211121983 and 121222211122001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121222211122091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60611105561010 + 60611105561011.

It is an arithmetic number, because the mean of its divisors is an integer number (60611105561011).

Almost surely, 2^{121222211122021} is an apocalyptic number.

It is an amenable number.

121222211122021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121222211122021 is an equidigital number, since it uses as much as digits as its factorization.

121222211122021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 121222211122021 its reverse (120221112222121), we get a palindrome (241443323344142).

The spelling of 121222211122021 in words is "one hundred twenty-one trillion, two hundred twenty-two billion, two hundred eleven million, one hundred twenty-two thousand, twenty-one".