1322320021 has 4 divisors (see below), whose sum is σ = 1442530944. Its totient is φ = 1202109100.

The previous prime is 1322320001. The next prime is 1322320031. The reversal of 1322320021 is 1200232231.

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 1322320021 - 2⁷ = 1322319893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1322319977 and 1322320004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1322320001) 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, 60105445 + ... + 60105466.

It is an arithmetic number, because the mean of its divisors is an integer number (360632736).

Almost surely, 2^1322320021 is an apocalyptic number.

1322320021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1322320021 is a deficient number, since it is larger than the sum of its proper divisors (120210923).

1322320021 is a wasteful number, since it uses less digits than its factorization.

1322320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120210922.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1322320021 is about 36363.7184704755. The cubic root of 1322320021 is about 1097.6036043559.

Adding to 1322320021 its reverse (1200232231), we get a palindrome (2522552252).

The spelling of 1322320021 in words is "one billion, three hundred twenty-two million, three hundred twenty thousand, twenty-one".