1221102111077 has 2 divisors, whose sum is σ = 1221102111078. Its totient is φ = 1221102111076.

The previous prime is 1221102111023. The next prime is 1221102111113. The reversal of 1221102111077 is 7701112011221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 824320542241 + 396781568836 = 907921^2 + 629906^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221102111077 - 2²⁴ = 1221085333861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221102111017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610551055538 + 610551055539.

It is an arithmetic number, because the mean of its divisors is an integer number (610551055539).

Almost surely, 2^{1221102111077} is an apocalyptic number.

It is an amenable number.

1221102111077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221102111077 is an equidigital number, since it uses as much as digits as its factorization.

1221102111077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 392, while the sum is 26.

Adding to 1221102111077 its reverse (7701112011221), we get a palindrome (8922214122298).

The spelling of 1221102111077 in words is "one trillion, two hundred twenty-one billion, one hundred two million, one hundred eleven thousand, seventy-seven".