21143403024 has 40 divisors (see below), whose sum is σ = 55161267072. Its totient is φ = 6978019200.

The previous prime is 21143403011. The next prime is 21143403041. The reversal of 21143403024 is 42030434112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 21143402985 and 21143403003.

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, 2175784 + ... + 2185479.

Almost surely, 2^21143403024 is an apocalyptic number.

21143403024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21143403024 is an abundant number, since it is smaller than the sum of its proper divisors (34017864048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21143403024 is a wasteful number, since it uses less digits than its factorization.

21143403024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4361375 (or 4361369 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21143403024 its reverse (42030434112), we get a palindrome (63173837136).

The spelling of 21143403024 in words is "twenty-one billion, one hundred forty-three million, four hundred three thousand, twenty-four".