1210121021077 has 2 divisors, whose sum is σ = 1210121021078. Its totient is φ = 1210121021076.

The previous prime is 1210121021069. The next prime is 1210121021119. The reversal of 1210121021077 is 7701201210121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1207869138961 + 2251882116 = 1099031^2 + 47454^2 .

It is an emirp because it is prime and its reverse (7701201210121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1210121021077 - 2³ = 1210121021069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210121021377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605060510538 + 605060510539.

It is an arithmetic number, because the mean of its divisors is an integer number (605060510539).

Almost surely, 2^{1210121021077} is an apocalyptic number.

It is an amenable number.

1210121021077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210121021077 is an equidigital number, since it uses as much as digits as its factorization.

1210121021077 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 25.

Adding to 1210121021077 its reverse (7701201210121), we get a palindrome (8911322231198).

The spelling of 1210121021077 in words is "one trillion, two hundred ten billion, one hundred twenty-one million, twenty-one thousand, seventy-seven".