21423247376 has 20 divisors (see below), whose sum is σ = 42846495744. Its totient is φ = 10366087200.

The previous prime is 21423247337. The next prime is 21423247411. The reversal of 21423247376 is 67374232412.

21423247376 is an admirable 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, 21595520 + ... + 21596511.

Almost surely, 2^21423247376 is an apocalyptic number.

It is an amenable number.

21423247376 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21423247376 is a wasteful number, since it uses less digits than its factorization.

21423247376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43192070 (or 43192064 counting only the distinct ones).

The product of its digits is 338688, while the sum is 41.

Adding to 21423247376 its reverse (67374232412), we get a palindrome (88797479788).

The spelling of 21423247376 in words is "twenty-one billion, four hundred twenty-three million, two hundred forty-seven thousand, three hundred seventy-six".