1221100121077 has 2 divisors, whose sum is σ = 1221100121078. Its totient is φ = 1221100121076.

The previous prime is 1221100121071. The next prime is 1221100121081. The reversal of 1221100121077 is 7701210011221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1183485070161 + 37615050916 = 1087881^2 + 193946^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221100121077 - 2²⁷ = 1220965903349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221100121071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610550060538 + 610550060539.

It is an arithmetic number, because the mean of its divisors is an integer number (610550060539).

Almost surely, 2^{1221100121077} is an apocalyptic number.

It is an amenable number.

1221100121077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221100121077 is an equidigital number, since it uses as much as digits as its factorization.

1221100121077 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 25.

Adding to 1221100121077 its reverse (7701210011221), we get a palindrome (8922310132298).

The spelling of 1221100121077 in words is "one trillion, two hundred twenty-one billion, one hundred million, one hundred twenty-one thousand, seventy-seven".