1221112110997 has 2 divisors, whose sum is σ = 1221112110998. Its totient is φ = 1221112110996.

The previous prime is 1221112110989. The next prime is 1221112111007. The reversal of 1221112110997 is 7990112111221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 785915937361 + 435196173636 = 886519^2 + 659694^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221112110997 - 2³ = 1221112110989 is a prime.

It is a super-2 number, since 2×1221112110997² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221112110937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610556055498 + 610556055499.

It is an arithmetic number, because the mean of its divisors is an integer number (610556055499).

Almost surely, 2^{1221112110997} is an apocalyptic number.

It is an amenable number.

1221112110997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221112110997 is an equidigital number, since it uses as much as digits as its factorization.

1221112110997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 37.

The spelling of 1221112110997 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, one hundred ten thousand, nine hundred ninety-seven".