1221122111983 has 2 divisors, whose sum is σ = 1221122111984. Its totient is φ = 1221122111982.

The previous prime is 1221122111977. The next prime is 1221122111987. The reversal of 1221122111983 is 3891112211221.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (3891112211221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221122111983 is a prime.

It is a super-2 number, since 2×1221122111983² (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 (1221122111987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610561055991 + 610561055992.

It is an arithmetic number, because the mean of its divisors is an integer number (610561055992).

Almost surely, 2^{1221122111983} is an apocalyptic number.

1221122111983 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221122111983 is an equidigital number, since it uses as much as digits as its factorization.

1221122111983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 34.

The spelling of 1221122111983 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two million, one hundred eleven thousand, nine hundred eighty-three".