1221111110027 has 2 divisors, whose sum is σ = 1221111110028. Its totient is φ = 1221111110026.

The previous prime is 1221111110003. The next prime is 1221111110071. The reversal of 1221111110027 is 7200111111221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221111110027 is a prime.

It is a super-2 number, since 2×1221111110027² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221111109990 and 1221111110008.

It is not a weakly prime, because it can be changed into another prime (1221111112027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610555555013 + 610555555014.

It is an arithmetic number, because the mean of its divisors is an integer number (610555555014).

Almost surely, 2^{1221111110027} is an apocalyptic number.

1221111110027 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221111110027 is an equidigital number, since it uses as much as digits as its factorization.

1221111110027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 20.

Adding to 1221111110027 its reverse (7200111111221), we get a palindrome (8421222221248).

The spelling of 1221111110027 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, one hundred ten thousand, twenty-seven".