1211000220077 has 2 divisors, whose sum is σ = 1211000220078. Its totient is φ = 1211000220076.

The previous prime is 1211000219987. The next prime is 1211000220119. The reversal of 1211000220077 is 7700220001121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1070450959876 + 140549260201 = 1034626^2 + 374899^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211000220077 - 2²⁸ = 1210731784621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211050220077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605500110038 + 605500110039.

It is an arithmetic number, because the mean of its divisors is an integer number (605500110039).

Almost surely, 2^{1211000220077} is an apocalyptic number.

It is an amenable number.

1211000220077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211000220077 is an equidigital number, since it uses as much as digits as its factorization.

1211000220077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 392, while the sum is 23.

Adding to 1211000220077 its reverse (7700220001121), we get a palindrome (8911220221198).

The spelling of 1211000220077 in words is "one trillion, two hundred eleven billion, two hundred twenty thousand, seventy-seven".