1211001099977 has 2 divisors, whose sum is σ = 1211001099978. Its totient is φ = 1211001099976.

The previous prime is 1211001099949. The next prime is 1211001100021. The reversal of 1211001099977 is 7799901001121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1147949387776 + 63051712201 = 1071424^2 + 251101^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211001099977 - 2¹⁰ = 1211001098953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211001099947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605500549988 + 605500549989.

It is an arithmetic number, because the mean of its divisors is an integer number (605500549989).

Almost surely, 2^{1211001099977} is an apocalyptic number.

It is an amenable number.

1211001099977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211001099977 is an equidigital number, since it uses as much as digits as its factorization.

1211001099977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 71442, while the sum is 47.

The spelling of 1211001099977 in words is "one trillion, two hundred eleven billion, one million, ninety-nine thousand, nine hundred seventy-seven".