1221111330371 has 2 divisors, whose sum is σ = 1221111330372. Its totient is φ = 1221111330370.

The previous prime is 1221111330343. The next prime is 1221111330389. The reversal of 1221111330371 is 1730331111221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221111330371 is a prime.

It is a super-2 number, since 2×1221111330371² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221111330371.

It is not a weakly prime, because it can be changed into another prime (1221111336371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610555665185 + 610555665186.

It is an arithmetic number, because the mean of its divisors is an integer number (610555665186).

Almost surely, 2^{1221111330371} is an apocalyptic number.

1221111330371 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221111330371 is an equidigital number, since it uses as much as digits as its factorization.

1221111330371 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 26.

Adding to 1221111330371 its reverse (1730331111221), we get a palindrome (2951442441592).

The spelling of 1221111330371 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, three hundred thirty thousand, three hundred seventy-one".