1220112121 has 2 divisors, whose sum is σ = 1220112122. Its totient is φ = 1220112120.

The previous prime is 1220112109. The next prime is 1220112133. The reversal of 1220112121 is 1212110221.

It is a balanced prime because it is at equal distance from previous prime (1220112109) and next prime (1220112133).

It can be written as a sum of positive squares in only one way, i.e., 1089330025 + 130782096 = 33005^2 + 11436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220112121 is a prime.

It is a super-2 number, since 2×1220112121² = 2977347175622237282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1220112181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610056060 + 610056061.

It is an arithmetic number, because the mean of its divisors is an integer number (610056061).

Almost surely, 2^1220112121 is an apocalyptic number.

It is an amenable number.

1220112121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220112121 is an equidigital number, since it uses as much as digits as its factorization.

1220112121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1220112121 is about 34930.1033637177. The cubic root of 1220112121 is about 1068.5624626494.

Adding to 1220112121 its reverse (1212110221), we get a palindrome (2432222342).

The spelling of 1220112121 in words is "one billion, two hundred twenty million, one hundred twelve thousand, one hundred twenty-one".