21523966430 has 8 divisors (see below), whose sum is σ = 38743139592. Its totient is φ = 8609586568.

The previous prime is 21523966423. The next prime is 21523966483. The reversal of 21523966430 is 3466932512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21523966430² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1076198312 + ... + 1076198331.

It is an arithmetic number, because the mean of its divisors is an integer number (4842892449).

Almost surely, 2^21523966430 is an apocalyptic number.

21523966430 is a deficient number, since it is larger than the sum of its proper divisors (17219173162).

21523966430 is a wasteful number, since it uses less digits than its factorization.

21523966430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2152396650.

The product of its (nonzero) digits is 233280, while the sum is 41.

The spelling of 21523966430 in words is "twenty-one billion, five hundred twenty-three million, nine hundred sixty-six thousand, four hundred thirty".