1299999021120 has 168 divisors, whose sum is σ = 4473108783000. Its totient is φ = 346538188800.

The previous prime is 1299999021119. The next prime is 1299999021161. The reversal of 1299999021120 is 211209999921.

It can be written as a sum of positive squares in 4 ways, for example, as 3078918144 + 1296920102976 = 55488^2 + 1138824^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7835020 + ... + 7999220.

Almost surely, 2^{1299999021120} is an apocalyptic number.

1299999021120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1299999021120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2236554391500).

1299999021120 is an abundant number, since it is smaller than the sum of its proper divisors (3173109761880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1299999021120 is a wasteful number, since it uses less digits than its factorization.

1299999021120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166973 (or 166960 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 54.

The spelling of 1299999021120 in words is "one trillion, two hundred ninety-nine billion, nine hundred ninety-nine million, twenty-one thousand, one hundred twenty".