1021211198977 has 2 divisors, whose sum is σ = 1021211198978. Its totient is φ = 1021211198976.

The previous prime is 1021211198957. The next prime is 1021211199053. The reversal of 1021211198977 is 7798911121201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 736093645681 + 285117553296 = 857959^2 + 533964^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021211198977 - 2¹⁹ = 1021210674689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021211198977.

It is not a weakly prime, because it can be changed into another prime (1021211198927) 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, 510605599488 + 510605599489.

It is an arithmetic number, because the mean of its divisors is an integer number (510605599489).

Almost surely, 2^{1021211198977} is an apocalyptic number.

It is an amenable number.

1021211198977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021211198977 is an equidigital number, since it uses as much as digits as its factorization.

1021211198977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 49.

The spelling of 1021211198977 in words is "one trillion, twenty-one billion, two hundred eleven million, one hundred ninety-eight thousand, nine hundred seventy-seven".