1321132021 has 4 divisors (see below), whose sum is σ = 1441234944. Its totient is φ = 1201029100.

The previous prime is 1321131989. The next prime is 1321132037. The reversal of 1321132021 is 1202311231.

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 1321132021 - 2⁵ = 1321131989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321131986 and 1321132004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321132061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60051445 + ... + 60051466.

It is an arithmetic number, because the mean of its divisors is an integer number (360308736).

Almost surely, 2^1321132021 is an apocalyptic number.

1321132021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1321132021 is a deficient number, since it is larger than the sum of its proper divisors (120102923).

1321132021 is a wasteful number, since it uses less digits than its factorization.

1321132021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120102922.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1321132021 is about 36347.3798367915. The cubic root of 1321132021 is about 1097.2748025137.

Adding to 1321132021 its reverse (1202311231), we get a palindrome (2523443252).

The spelling of 1321132021 in words is "one billion, three hundred twenty-one million, one hundred thirty-two thousand, twenty-one".