1211121119947 has 2 divisors, whose sum is σ = 1211121119948. Its totient is φ = 1211121119946.

The previous prime is 1211121119939. The next prime is 1211121119983. The reversal of 1211121119947 is 7499111211121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211121119947 - 2³ = 1211121119939 is a prime.

It is a super-2 number, since 2×1211121119947² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1211121119347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605560559973 + 605560559974.

It is an arithmetic number, because the mean of its divisors is an integer number (605560559974).

Almost surely, 2^{1211121119947} is an apocalyptic number.

1211121119947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211121119947 is an equidigital number, since it uses as much as digits as its factorization.

1211121119947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 40.

The spelling of 1211121119947 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, one hundred nineteen thousand, nine hundred forty-seven".