1221112101997 has 2 divisors, whose sum is σ = 1221112101998. Its totient is φ = 1221112101996.

The previous prime is 1221112101953. The next prime is 1221112102013. The reversal of 1221112101997 is 7991012111221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1188232983721 + 32879118276 = 1090061^2 + 181326^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221112101997 is a prime.

It is a super-2 number, since 2×1221112101997² (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 (1221112101497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610556050998 + 610556050999.

It is an arithmetic number, because the mean of its divisors is an integer number (610556050999).

Almost surely, 2^{1221112101997} is an apocalyptic number.

It is an amenable number.

1221112101997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221112101997 is an equidigital number, since it uses as much as digits as its factorization.

1221112101997 is an evil number, because the sum of its binary digits is even.

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

The spelling of 1221112101997 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, one hundred one thousand, nine hundred ninety-seven".