1299298929921 has 12 divisors (see below), whose sum is σ = 1893983151060. Its totient is φ = 858252503520.

The previous prime is 1299298929919. The next prime is 1299298929977.

1299298929921 is a `hidden beast` number, since 1 + 29 + 9 + 298 + 9 + 299 + 21 = 666.

1299298929921 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 349919571600 + 949379358321 = 591540^2 + 974361^2 .

It is not a de Polignac number, because 1299298929921 - 2¹ = 1299298929919 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1299298929921.

It is not an unprimeable number, because it can be changed into a prime (1299298929911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 662230890 + ... + 662232851.

It is an arithmetic number, because the mean of its divisors is an integer number (157831929255).

Almost surely, 2^{1299298929921} is an apocalyptic number.

It is an amenable number.

1299298929921 is a deficient number, since it is larger than the sum of its proper divisors (594684221139).

1299298929921 is a wasteful number, since it uses less digits than its factorization.

1299298929921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324463856 (or 1324463853 counting only the distinct ones).

The product of its digits is 68024448, while the sum is 72.

The spelling of 1299298929921 in words is "one trillion, two hundred ninety-nine billion, two hundred ninety-eight million, nine hundred twenty-nine thousand, nine hundred twenty-one".