21143244124 has 12 divisors (see below), whose sum is σ = 37046419200. Its totient is φ = 10558552928.

The previous prime is 21143244053. The next prime is 21143244139. The reversal of 21143244124 is 42144234112.

It is a junction number, because it is equal to n+sod(n) for n = 21143244092 and 21143244101.

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, 3263644 + ... + 3270115.

It is an arithmetic number, because the mean of its divisors is an integer number (3087201600).

Almost surely, 2^21143244124 is an apocalyptic number.

It is an amenable number.

21143244124 is a deficient number, since it is larger than the sum of its proper divisors (15903175076).

21143244124 is a wasteful number, since it uses less digits than its factorization.

21143244124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6534572 (or 6534570 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

Adding to 21143244124 its reverse (42144234112), we get a palindrome (63287478236).

The spelling of 21143244124 in words is "twenty-one billion, one hundred forty-three million, two hundred forty-four thousand, one hundred twenty-four".