1321229771999 has 8 divisors (see below), whose sum is σ = 1343306911248. Its totient is φ = 1299166104960.

The previous prime is 1321229771959. The next prime is 1321229772013. The reversal of 1321229771999 is 9991779221231.

It is a happy number.

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 1321229771999 - 2²⁸ = 1320961336543 is a prime.

It is a super-2 number, since 2×1321229771999² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321229771959) 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, 3170177 + ... + 3562650.

It is an arithmetic number, because the mean of its divisors is an integer number (167913363906).

Almost surely, 2^{1321229771999} is an apocalyptic number.

1321229771999 is a deficient number, since it is larger than the sum of its proper divisors (22077139249).

1321229771999 is an equidigital number, since it uses as much as digits as its factorization.

1321229771999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6736105.

The product of its digits is 7715736, while the sum is 62.

The spelling of 1321229771999 in words is "one trillion, three hundred twenty-one billion, two hundred twenty-nine million, seven hundred seventy-one thousand, nine hundred ninety-nine".