21320012233 has 8 divisors (see below), whose sum is σ = 24168435200. Its totient is φ = 18644221008.

The previous prime is 21320012227. The next prime is 21320012243. The reversal of 21320012233 is 33221002312.

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 21320012233 - 2¹⁷ = 21319881161 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21320012233.

It is not an unprimeable number, because it can be changed into a prime (21320012243) 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, 43157673 + ... + 43158166.

It is an arithmetic number, because the mean of its divisors is an integer number (3021054400).

Almost surely, 2^21320012233 is an apocalyptic number.

It is an amenable number.

21320012233 is a deficient number, since it is larger than the sum of its proper divisors (2848422967).

21320012233 is a wasteful number, since it uses less digits than its factorization.

21320012233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86315871.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21320012233 its reverse (33221002312), we get a palindrome (54541014545).

The spelling of 21320012233 in words is "twenty-one billion, three hundred twenty million, twelve thousand, two hundred thirty-three".