1211201211977 has 2 divisors, whose sum is σ = 1211201211978. Its totient is φ = 1211201211976.

The previous prime is 1211201211973. The next prime is 1211201212063. The reversal of 1211201211977 is 7791121021121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1059789950521 + 151411261456 = 1029461^2 + 389116^2 .

It is an emirp because it is prime and its reverse (7791121021121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211201211977 - 2² = 1211201211973 is a prime.

It is a super-4 number, since 4×1211201211977⁴ (a number of 49 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (1211201211973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605600605988 + 605600605989.

It is an arithmetic number, because the mean of its divisors is an integer number (605600605989).

Almost surely, 2^{1211201211977} is an apocalyptic number.

It is an amenable number.

1211201211977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211201211977 is an equidigital number, since it uses as much as digits as its factorization.

1211201211977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 35.

The spelling of 1211201211977 in words is "one trillion, two hundred eleven billion, two hundred one million, two hundred eleven thousand, nine hundred seventy-seven".