1221011121179 has 2 divisors, whose sum is σ = 1221011121180. Its totient is φ = 1221011121178.

The previous prime is 1221011121101. The next prime is 1221011121193. The reversal of 1221011121179 is 9711211101221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221011121179 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221011121079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610505560589 + 610505560590.

It is an arithmetic number, because the mean of its divisors is an integer number (610505560590).

Almost surely, 2^{1221011121179} is an apocalyptic number.

1221011121179 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221011121179 is an equidigital number, since it uses as much as digits as its factorization.

1221011121179 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 29.

The spelling of 1221011121179 in words is "one trillion, two hundred twenty-one billion, eleven million, one hundred twenty-one thousand, one hundred seventy-nine".