1211111200979 has 2 divisors, whose sum is σ = 1211111200980. Its totient is φ = 1211111200978.

The previous prime is 1211111200961. The next prime is 1211111201009. The reversal of 1211111200979 is 9790021111121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211111200979 - 2²⁸ = 1210842765523 is a prime.

It is a super-2 number, since 2×1211111200979² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1211111200279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605555600489 + 605555600490.

It is an arithmetic number, because the mean of its divisors is an integer number (605555600490).

Almost surely, 2^{1211111200979} is an apocalyptic number.

1211111200979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211111200979 is an equidigital number, since it uses as much as digits as its factorization.

1211111200979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 35.

The spelling of 1211111200979 in words is "one trillion, two hundred eleven billion, one hundred eleven million, two hundred thousand, nine hundred seventy-nine".