1021209977369 has 2 divisors, whose sum is σ = 1021209977370. Its totient is φ = 1021209977368.

The previous prime is 1021209977357. The next prime is 1021209977471. The reversal of 1021209977369 is 9637799021201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1017348597769 + 3861379600 = 1008637^2 + 62140^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021209977369 - 2⁴ = 1021209977353 is a prime.

It is a super-2 number, since 2×1021209977369² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1021209977339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510604988684 + 510604988685.

It is an arithmetic number, because the mean of its divisors is an integer number (510604988685).

Almost surely, 2^{1021209977369} is an apocalyptic number.

It is an amenable number.

1021209977369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021209977369 is an equidigital number, since it uses as much as digits as its factorization.

1021209977369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2571912, while the sum is 56.

The spelling of 1021209977369 in words is "one trillion, twenty-one billion, two hundred nine million, nine hundred seventy-seven thousand, three hundred sixty-nine".