21213033223 has 8 divisors (see below), whose sum is σ = 21642784416. Its totient is φ = 20785927200.

The previous prime is 21213033209. The next prime is 21213033241. The reversal of 21213033223 is 32233031212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21213033223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21213033194 and 21213033203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213033323) 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, 645088 + ... + 677173.

It is an arithmetic number, because the mean of its divisors is an integer number (2705348052).

Almost surely, 2^21213033223 is an apocalyptic number.

21213033223 is a deficient number, since it is larger than the sum of its proper divisors (429751193).

21213033223 is a wasteful number, since it uses less digits than its factorization.

21213033223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322585.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21213033223 its reverse (32233031212), we get a palindrome (53446064435).

The spelling of 21213033223 in words is "twenty-one billion, two hundred thirteen million, thirty-three thousand, two hundred twenty-three".