21124432430 has 16 divisors (see below), whose sum is σ = 38025955440. Its totient is φ = 8449333632.

The previous prime is 21124432403. The next prime is 21124432481. The reversal of 21124432430 is 3423442112.

It is a self number, because there is not a number n which added to its sum of digits gives 21124432430.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206102 + ... + 291078.

It is an arithmetic number, because the mean of its divisors is an integer number (2376622215).

Almost surely, 2^21124432430 is an apocalyptic number.

21124432430 is a deficient number, since it is larger than the sum of its proper divisors (16901523010).

21124432430 is a wasteful number, since it uses less digits than its factorization.

21124432430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109843.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21124432430 its reverse (3423442112), we get a palindrome (24547874542).

The spelling of 21124432430 in words is "twenty-one billion, one hundred twenty-four million, four hundred thirty-two thousand, four hundred thirty".