1221011100227 has 2 divisors, whose sum is σ = 1221011100228. Its totient is φ = 1221011100226.

The previous prime is 1221011100139. The next prime is 1221011100229. The reversal of 1221011100227 is 7220011101221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221011100227 - 2¹² = 1221011096131 is a prime.

Together with 1221011100229, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221011100199 and 1221011100208.

It is not a weakly prime, because it can be changed into another prime (1221011100229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610505550113 + 610505550114.

It is an arithmetic number, because the mean of its divisors is an integer number (610505550114).

Almost surely, 2^{1221011100227} is an apocalyptic number.

1221011100227 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221011100227 is an equidigital number, since it uses as much as digits as its factorization.

1221011100227 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 1221011100227 its reverse (7220011101221), we get a palindrome (8441022201448).

The spelling of 1221011100227 in words is "one trillion, two hundred twenty-one billion, eleven million, one hundred thousand, two hundred twenty-seven".