1242211121 has 2 divisors, whose sum is σ = 1242211122. Its totient is φ = 1242211120.

The previous prime is 1242211109. The next prime is 1242211129. The reversal of 1242211121 is 1211122421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1194670096 + 47541025 = 34564^2 + 6895^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242211121 - 2¹⁰ = 1242210097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1242211121.

It is not a weakly prime, because it can be changed into another prime (1242211129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621105560 + 621105561.

It is an arithmetic number, because the mean of its divisors is an integer number (621105561).

Almost surely, 2^1242211121 is an apocalyptic number.

It is an amenable number.

1242211121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242211121 is an equidigital number, since it uses as much as digits as its factorization.

1242211121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64, while the sum is 17.

The square root of 1242211121 is about 35245.0155483013. The cubic root of 1242211121 is about 1074.9752641866.

Adding to 1242211121 its reverse (1211122421), we get a palindrome (2453333542).

The spelling of 1242211121 in words is "one billion, two hundred forty-two million, two hundred eleven thousand, one hundred twenty-one".