1221112222081 has 2 divisors, whose sum is σ = 1221112222082. Its totient is φ = 1221112222080.

The previous prime is 1221112222069. The next prime is 1221112222093. The reversal of 1221112222081 is 1802222111221.

It is a balanced prime because it is at equal distance from previous prime (1221112222069) and next prime (1221112222093).

It can be written as a sum of positive squares in only one way, i.e., 909764961856 + 311347260225 = 953816^2 + 557985^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221112222081 - 2²³ = 1221103833473 is a prime.

It is a super-2 number, since 2×1221112222081² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221112222481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610556111040 + 610556111041.

It is an arithmetic number, because the mean of its divisors is an integer number (610556111041).

Almost surely, 2^{1221112222081} is an apocalyptic number.

It is an amenable number.

1221112222081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221112222081 is an equidigital number, since it uses as much as digits as its factorization.

1221112222081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 25.

The spelling of 1221112222081 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, two hundred twenty-two thousand, eighty-one".