21050423423 has 8 divisors (see below), whose sum is σ = 21967802208. Its totient is φ = 20133223264.

The previous prime is 21050423389. The next prime is 21050423441. The reversal of 21050423423 is 32432405012.

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 21050423423 - 2³² = 16755456127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21050423392 and 21050423401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050423473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232961 + ... + 310437.

It is an arithmetic number, because the mean of its divisors is an integer number (2745975276).

Almost surely, 2^21050423423 is an apocalyptic number.

21050423423 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21050423423 is a deficient number, since it is larger than the sum of its proper divisors (917378785).

21050423423 is a wasteful number, since it uses less digits than its factorization.

21050423423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89313.

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 21050423423 its reverse (32432405012), we get a palindrome (53482828435).

The spelling of 21050423423 in words is "twenty-one billion, fifty million, four hundred twenty-three thousand, four hundred twenty-three".