21323429830 has 16 divisors (see below), whose sum is σ = 38658306960. Its totient is φ = 8468008992.

The previous prime is 21323429761. The next prime is 21323429857. The reversal of 21323429830 is 3892432312.

It is a self number, because there is not a number n which added to its sum of digits gives 21323429830.

It is a congruent number.

It is an unprimeable number.

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, 7668909 + ... + 7671688.

It is an arithmetic number, because the mean of its divisors is an integer number (2416144185).

Almost surely, 2^21323429830 is an apocalyptic number.

21323429830 is a deficient number, since it is larger than the sum of its proper divisors (17334877130).

21323429830 is a wasteful number, since it uses less digits than its factorization.

21323429830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15340743.

The product of its (nonzero) digits is 62208, while the sum is 37.

The spelling of 21323429830 in words is "twenty-one billion, three hundred twenty-three million, four hundred twenty-nine thousand, eight hundred thirty".