1299999021121 has 4 divisors (see below), whose sum is σ = 1300263307200. Its totient is φ = 1299734735044.

The previous prime is 1299999021119. The next prime is 1299999021161. The reversal of 1299999021121 is 1211209999921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1299999021121 - 2¹ = 1299999021119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1299999021161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132135661 + ... + 132145498.

It is an arithmetic number, because the mean of its divisors is an integer number (325065826800).

Almost surely, 2^{1299999021121} is an apocalyptic number.

It is an amenable number.

1299999021121 is a deficient number, since it is larger than the sum of its proper divisors (264286079).

1299999021121 is an equidigital number, since it uses as much as digits as its factorization.

1299999021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264286078.

The product of its (nonzero) digits is 472392, while the sum is 55.

The spelling of 1299999021121 in words is "one trillion, two hundred ninety-nine billion, nine hundred ninety-nine million, twenty-one thousand, one hundred twenty-one".