1221250631077 has 2 divisors, whose sum is σ = 1221250631078. Its totient is φ = 1221250631076.

The previous prime is 1221250631033. The next prime is 1221250631087. The reversal of 1221250631077 is 7701360521221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 871551077761 + 349699553316 = 933569^2 + 591354^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221250631077 - 2¹¹ = 1221250629029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221250631087) 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, 610625315538 + 610625315539.

It is an arithmetic number, because the mean of its divisors is an integer number (610625315539).

Almost surely, 2^{1221250631077} is an apocalyptic number.

It is an amenable number.

1221250631077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221250631077 is an equidigital number, since it uses as much as digits as its factorization.

1221250631077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 1221250631077 in words is "one trillion, two hundred twenty-one billion, two hundred fifty million, six hundred thirty-one thousand, seventy-seven".