21304424476 has 48 divisors (see below), whose sum is σ = 38582580960. Its totient is φ = 10287083520.

The previous prime is 21304424441. The next prime is 21304424503. The reversal of 21304424476 is 67442440312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6337036 + ... + 6340396.

It is an arithmetic number, because the mean of its divisors is an integer number (803803770).

Almost surely, 2^21304424476 is an apocalyptic number.

It is an amenable number.

21304424476 is a deficient number, since it is larger than the sum of its proper divisors (17278156484).

21304424476 is a wasteful number, since it uses less digits than its factorization.

21304424476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3814 (or 3812 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 37.

Adding to 21304424476 its reverse (67442440312), we get a palindrome (88746864788).

The spelling of 21304424476 in words is "twenty-one billion, three hundred four million, four hundred twenty-four thousand, four hundred seventy-six".