1221131003077 has 2 divisors, whose sum is σ = 1221131003078. Its totient is φ = 1221131003076.

The previous prime is 1221131003023. The next prime is 1221131003087. The reversal of 1221131003077 is 7703001311221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1063866410721 + 157264592356 = 1031439^2 + 396566^2 .

It is an emirp because it is prime and its reverse (7703001311221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221131003077 - 2¹¹ = 1221131001029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221131003087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610565501538 + 610565501539.

It is an arithmetic number, because the mean of its divisors is an integer number (610565501539).

Almost surely, 2^{1221131003077} is an apocalyptic number.

It is an amenable number.

1221131003077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221131003077 is an equidigital number, since it uses as much as digits as its factorization.

1221131003077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 28.

Adding to 1221131003077 its reverse (7703001311221), we get a palindrome (8924132314298).

The spelling of 1221131003077 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-one million, three thousand, seventy-seven".