1220022121 has 2 divisors, whose sum is σ = 1220022122. Its totient is φ = 1220022120.

The previous prime is 1220022109. The next prime is 1220022149. The reversal of 1220022121 is 1212200221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 668946496 + 551075625 = 25864^2 + 23475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220022121 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220022151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610011060 + 610011061.

It is an arithmetic number, because the mean of its divisors is an integer number (610011061).

Almost surely, 2^1220022121 is an apocalyptic number.

It is an amenable number.

1220022121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220022121 is an equidigital number, since it uses as much as digits as its factorization.

1220022121 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 13.

The square root of 1220022121 is about 34928.8150529044. The cubic root of 1220022121 is about 1068.5361882919.

Adding to 1220022121 its reverse (1212200221), we get a palindrome (2432222342).

The spelling of 1220022121 in words is "one billion, two hundred twenty million, twenty-two thousand, one hundred twenty-one".