21423430232 has 16 divisors (see below), whose sum is σ = 40297271640. Its totient is φ = 10677491136.

The previous prime is 21423430169. The next prime is 21423430279. The reversal of 21423430232 is 23203432412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4275338 + ... + 4280345.

Almost surely, 2^21423430232 is an apocalyptic number.

It is an amenable number.

21423430232 is a deficient number, since it is larger than the sum of its proper divisors (18873841408).

21423430232 is a wasteful number, since it uses less digits than its factorization.

21423430232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8556002 (or 8555998 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 21423430232 its reverse (23203432412), we get a palindrome (44626862644).

The spelling of 21423430232 in words is "twenty-one billion, four hundred twenty-three million, four hundred thirty thousand, two hundred thirty-two".