21103230423 has 24 divisors (see below), whose sum is σ = 31764066544. Its totient is φ = 12444157440.

The previous prime is 21103230419. The next prime is 21103230481. The reversal of 21103230423 is 32403230112.

It is not a de Polignac number, because 21103230423 - 2² = 21103230419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21103230423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103230413) 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 23 ways as a sum of consecutive naturals, for example, 772186 + ... + 799047.

Almost surely, 2^21103230423 is an apocalyptic number.

21103230423 is a deficient number, since it is larger than the sum of its proper divisors (10660836121).

21103230423 is a wasteful number, since it uses less digits than its factorization.

21103230423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571295 (or 1571284 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21103230423 its reverse (32403230112), we get a palindrome (53506460535).

The spelling of 21103230423 in words is "twenty-one billion, one hundred three million, two hundred thirty thousand, four hundred twenty-three".