21143303406 has 24 divisors (see below), whose sum is σ = 45955015704. Its totient is φ = 7025533200.

The previous prime is 21143303387. The next prime is 21143303413. The reversal of 21143303406 is 60430334112.

21143303406 is a `hidden beast` number, since 211 + 43 + 3 + 0 + 3 + 406 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21143303406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1847020 + ... + 1858431.

It is an arithmetic number, because the mean of its divisors is an integer number (1914792321).

Almost surely, 2^21143303406 is an apocalyptic number.

21143303406 is an abundant number, since it is smaller than the sum of its proper divisors (24811712298).

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

21143303406 is a wasteful number, since it uses less digits than its factorization.

21143303406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3705776 (or 3705773 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 21143303406 its reverse (60430334112), we get a palindrome (81573637518).

The spelling of 21143303406 in words is "twenty-one billion, one hundred forty-three million, three hundred three thousand, four hundred six".