1221011107 has 2 divisors, whose sum is σ = 1221011108. Its totient is φ = 1221011106.

The previous prime is 1221011093. The next prime is 1221011177. The reversal of 1221011107 is 7011101221.

It is a weak prime.

It is an emirp because it is prime and its reverse (7011101221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221011107 - 2¹⁹ = 1220486819 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221011177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610505553 + 610505554.

It is an arithmetic number, because the mean of its divisors is an integer number (610505554).

Almost surely, 2^1221011107 is an apocalyptic number.

1221011107 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221011107 is an equidigital number, since it uses as much as digits as its factorization.

1221011107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 16.

The square root of 1221011107 is about 34942.9693500710. The cubic root of 1221011107 is about 1068.8248393177.

Adding to 1221011107 its reverse (7011101221), we get a palindrome (8232112328).

The spelling of 1221011107 in words is "one billion, two hundred twenty-one million, eleven thousand, one hundred seven".