21143310424 has 16 divisors (see below), whose sum is σ = 40014210600. Its totient is φ = 10472854272.

The previous prime is 21143310413. The next prime is 21143310437. The reversal of 21143310424 is 42401334112.

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, 12349209 + ... + 12350920.

Almost surely, 2^21143310424 is an apocalyptic number.

It is an amenable number.

21143310424 is a deficient number, since it is larger than the sum of its proper divisors (18870900176).

21143310424 is a wasteful number, since it uses less digits than its factorization.

21143310424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24700242 (or 24700238 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21143310424 its reverse (42401334112), we get a palindrome (63544644536).

The spelling of 21143310424 in words is "twenty-one billion, one hundred forty-three million, three hundred ten thousand, four hundred twenty-four".