1222021121 has 2 divisors, whose sum is σ = 1222021122. Its totient is φ = 1222021120.

The previous prime is 1222021093. The next prime is 1222021133. The reversal of 1222021121 is 1211202221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 650811121 + 571210000 = 25511^2 + 23900^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222021121 - 2¹⁴ = 1222004737 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1222021096 and 1222021105.

It is not a weakly prime, because it can be changed into another prime (1222021621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611010560 + 611010561.

It is an arithmetic number, because the mean of its divisors is an integer number (611010561).

Almost surely, 2^1222021121 is an apocalyptic number.

It is an amenable number.

1222021121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222021121 is an equidigital number, since it uses as much as digits as its factorization.

1222021121 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 14.

The square root of 1222021121 is about 34957.4186833067. The cubic root of 1222021121 is about 1069.1194668663.

Adding to 1222021121 its reverse (1211202221), we get a palindrome (2433223342).

The spelling of 1222021121 in words is "one billion, two hundred twenty-two million, twenty-one thousand, one hundred twenty-one".