1299930066821 has 8 divisors (see below), whose sum is σ = 1312875379704. Its totient is φ = 1286986219200.

The previous prime is 1299930066779. The next prime is 1299930066833. The reversal of 1299930066821 is 1286600399921.

It can be written as a sum of positive squares in 4 ways, for example, as 872148664321 + 427781402500 = 933889^2 + 654050^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1299930066821 - 2³⁴ = 1282750197637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299930066881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1462055 + ... + 2176571.

It is an arithmetic number, because the mean of its divisors is an integer number (164109422463).

Almost surely, 2^{1299930066821} is an apocalyptic number.

It is an amenable number.

1299930066821 is a deficient number, since it is larger than the sum of its proper divisors (12945312883).

1299930066821 is a wasteful number, since it uses less digits than its factorization.

1299930066821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732631.

The product of its (nonzero) digits is 2519424, while the sum is 56.

The spelling of 1299930066821 in words is "one trillion, two hundred ninety-nine billion, nine hundred thirty million, sixty-six thousand, eight hundred twenty-one".