21233013623 has 2 divisors, whose sum is σ = 21233013624. Its totient is φ = 21233013622.

The previous prime is 21233013611. The next prime is 21233013629. The reversal of 21233013623 is 32631033212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21233013623 - 2⁸ = 21233013367 is a prime.

It is a super-2 number, since 2×21233013623² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21233013592 and 21233013601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21233013629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616506811 + 10616506812.

It is an arithmetic number, because the mean of its divisors is an integer number (10616506812).

Almost surely, 2^21233013623 is an apocalyptic number.

21233013623 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233013623 is an equidigital number, since it uses as much as digits as its factorization.

21233013623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 21233013623 its reverse (32631033212), we get a palindrome (53864046835).

The spelling of 21233013623 in words is "twenty-one billion, two hundred thirty-three million, thirteen thousand, six hundred twenty-three".