1211001021959 has 2 divisors, whose sum is σ = 1211001021960. Its totient is φ = 1211001021958.

The previous prime is 1211001021947. The next prime is 1211001022001. The reversal of 1211001021959 is 9591201001121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211001021959 - 2³² = 1206706054663 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211001021259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605500510979 + 605500510980.

It is an arithmetic number, because the mean of its divisors is an integer number (605500510980).

Almost surely, 2^{1211001021959} is an apocalyptic number.

1211001021959 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211001021959 is an equidigital number, since it uses as much as digits as its factorization.

1211001021959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 32.

The spelling of 1211001021959 in words is "one trillion, two hundred eleven billion, one million, twenty-one thousand, nine hundred fifty-nine".