21333213321 has 16 divisors (see below), whose sum is σ = 33386342784. Its totient is φ = 11860936704.

The previous prime is 21333213313. The next prime is 21333213329. The reversal of 21333213321 is 12331233312.

It is an interprime number because it is at equal distance from previous prime (21333213313) and next prime (21333213329).

It is not a de Polignac number, because 21333213321 - 2³ = 21333213313 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21333213291 and 21333213300.

It is not an unprimeable number, because it can be changed into a prime (21333213329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13727160 + ... + 13728713.

It is an arithmetic number, because the mean of its divisors is an integer number (2086646424).

Almost surely, 2^21333213321 is an apocalyptic number.

21333213321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21333213321 is a deficient number, since it is larger than the sum of its proper divisors (12053129463).

21333213321 is a wasteful number, since it uses less digits than its factorization.

21333213321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27455920.

The product of its digits is 1944, while the sum is 24.

Adding to 21333213321 its reverse (12331233312), we get a palindrome (33664446633).

The spelling of 21333213321 in words is "twenty-one billion, three hundred thirty-three million, two hundred thirteen thousand, three hundred twenty-one".