21682406233 has 4 divisors (see below), whose sum is σ = 21731797120. Its totient is φ = 21633015348.

The previous prime is 21682406227. The next prime is 21682406267. The reversal of 21682406233 is 33260428612.

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 a de Polignac number, because none of the positive numbers 2^k-21682406233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21682406192 and 21682406201.

It is not an unprimeable number, because it can be changed into a prime (21682406633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24694785 + ... + 24695662.

It is an arithmetic number, because the mean of its divisors is an integer number (5432949280).

Almost surely, 2^21682406233 is an apocalyptic number.

It is an amenable number.

21682406233 is a deficient number, since it is larger than the sum of its proper divisors (49390887).

21682406233 is an equidigital number, since it uses as much as digits as its factorization.

21682406233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49390886.

The product of its (nonzero) digits is 82944, while the sum is 37.

The spelling of 21682406233 in words is "twenty-one billion, six hundred eighty-two million, four hundred six thousand, two hundred thirty-three".