1321130021 has 8 divisors (see below), whose sum is σ = 1391500320. Its totient is φ = 1250843472.

The previous prime is 1321130011. The next prime is 1321130023. The reversal of 1321130021 is 1200311231.

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 1321130021 - 2¹⁴ = 1321113637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321129978 and 1321130005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321130023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12866 + ... + 52988.

It is an arithmetic number, because the mean of its divisors is an integer number (173937540).

Almost surely, 2^1321130021 is an apocalyptic number.

It is an amenable number.

1321130021 is a deficient number, since it is larger than the sum of its proper divisors (70370299).

1321130021 is a wasteful number, since it uses less digits than its factorization.

1321130021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41875.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1321130021 is about 36347.3523244816. The cubic root of 1321130021 is about 1097.2742488091.

Adding to 1321130021 its reverse (1200311231), we get a palindrome (2521441252).

The spelling of 1321130021 in words is "one billion, three hundred twenty-one million, one hundred thirty thousand, twenty-one".