1220232121 has 2 divisors, whose sum is σ = 1220232122. Its totient is φ = 1220232120.

The previous prime is 1220232109. The next prime is 1220232131. The reversal of 1220232121 is 1212320221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 911738025 + 308494096 = 30195^2 + 17564^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220232121 - 2⁵ = 1220232089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220232095 and 1220232104.

It is not a weakly prime, because it can be changed into another prime (1220232131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610116060 + 610116061.

It is an arithmetic number, because the mean of its divisors is an integer number (610116061).

Almost surely, 2^1220232121 is an apocalyptic number.

It is an amenable number.

1220232121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220232121 is an equidigital number, since it uses as much as digits as its factorization.

1220232121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1220232121 is about 34931.8210375583. The cubic root of 1220232121 is about 1068.5974931163.

Adding to 1220232121 its reverse (1212320221), we get a palindrome (2432552342).

The spelling of 1220232121 in words is "one billion, two hundred twenty million, two hundred thirty-two thousand, one hundred twenty-one".