21103333423 has 2 divisors, whose sum is σ = 21103333424. Its totient is φ = 21103333422.

The previous prime is 21103333393. The next prime is 21103333439. The reversal of 21103333423 is 32433330112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21103333423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21103313423) 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, 10551666711 + 10551666712.

It is an arithmetic number, because the mean of its divisors is an integer number (10551666712).

Almost surely, 2^21103333423 is an apocalyptic number.

21103333423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103333423 is an equidigital number, since it uses as much as digits as its factorization.

21103333423 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 25.

Adding to 21103333423 its reverse (32433330112), we get a palindrome (53536663535).

The spelling of 21103333423 in words is "twenty-one billion, one hundred three million, three hundred thirty-three thousand, four hundred twenty-three".