21142331344 has 20 divisors (see below), whose sum is σ = 40988494624. Its totient is φ = 10564655328.

The previous prime is 21142331311. The next prime is 21142331479. The reversal of 21142331344 is 44313324112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380052 + ... + 432115.

Almost surely, 2^21142331344 is an apocalyptic number.

It is an amenable number.

21142331344 is a deficient number, since it is larger than the sum of its proper divisors (19846163280).

21142331344 is a wasteful number, since it uses less digits than its factorization.

21142331344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813802 (or 813796 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

Adding to 21142331344 its reverse (44313324112), we get a palindrome (65455655456).

The spelling of 21142331344 in words is "twenty-one billion, one hundred forty-two million, three hundred thirty-one thousand, three hundred forty-four".