21033331321 has 8 divisors (see below), whose sum is σ = 21548419200. Its totient is φ = 20518342560.

The previous prime is 21033331309. The next prime is 21033331339. The reversal of 21033331321 is 12313333012.

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 21033331321 - 2²³ = 21024942713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21033331292 and 21033331301.

It is not an unprimeable number, because it can be changed into a prime (21033331301) 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, 587740 + ... + 622498.

It is an arithmetic number, because the mean of its divisors is an integer number (2693552400).

Almost surely, 2^21033331321 is an apocalyptic number.

It is an amenable number.

21033331321 is a deficient number, since it is larger than the sum of its proper divisors (515087879).

21033331321 is a wasteful number, since it uses less digits than its factorization.

21033331321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49559.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21033331321 its reverse (12313333012), we get a palindrome (33346664333).

The spelling of 21033331321 in words is "twenty-one billion, thirty-three million, three hundred thirty-one thousand, three hundred twenty-one".