21142430024 has 32 divisors (see below), whose sum is σ = 41392520640. Its totient is φ = 10105022400.

The previous prime is 21142429951. The next prime is 21142430051. The reversal of 21142430024 is 42003424112.

It is a Harshad number since it is a multiple of its sum of digits (23).

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, 252494 + ... + 325634.

It is an arithmetic number, because the mean of its divisors is an integer number (1293516270).

Almost surely, 2^21142430024 is an apocalyptic number.

It is an amenable number.

21142430024 is a deficient number, since it is larger than the sum of its proper divisors (20250090616).

21142430024 is a wasteful number, since it uses less digits than its factorization.

21142430024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74741 (or 74737 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21142430024 its reverse (42003424112), we get a palindrome (63145854136).

The spelling of 21142430024 in words is "twenty-one billion, one hundred forty-two million, four hundred thirty thousand, twenty-four".