1221024121 has 2 divisors, whose sum is σ = 1221024122. Its totient is φ = 1221024120.

The previous prime is 1221024097. The next prime is 1221024137. The reversal of 1221024121 is 1214201221.

It is an a-pointer prime, because the next prime (1221024137) can be obtained adding 1221024121 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1131986025 + 89038096 = 33645^2 + 9436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221024121 - 2⁵ = 1221024089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221024095 and 1221024104.

It is not a weakly prime, because it can be changed into another prime (1221024821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610512060 + 610512061.

It is an arithmetic number, because the mean of its divisors is an integer number (610512061).

Almost surely, 2^1221024121 is an apocalyptic number.

It is an amenable number.

1221024121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221024121 is an equidigital number, since it uses as much as digits as its factorization.

1221024121 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 16.

The square root of 1221024121 is about 34943.1555672924. The cubic root of 1221024121 is about 1068.8286366179.

Adding to 1221024121 its reverse (1214201221), we get a palindrome (2435225342).

The spelling of 1221024121 in words is "one billion, two hundred twenty-one million, twenty-four thousand, one hundred twenty-one".