21582946406 has 16 divisors (see below), whose sum is σ = 37754426400. Its totient is φ = 9249833880.

The previous prime is 21582946367. The next prime is 21582946421. The reversal of 21582946406 is 60464928512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15730325 + ... + 15731696.

It is an arithmetic number, because the mean of its divisors is an integer number (2359651650).

Almost surely, 2^21582946406 is an apocalyptic number.

21582946406 is a deficient number, since it is larger than the sum of its proper divisors (16171479994).

21582946406 is an equidigital number, since it uses as much as digits as its factorization.

21582946406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31462044 (or 31462030 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 21582946406 in words is "twenty-one billion, five hundred eighty-two million, nine hundred forty-six thousand, four hundred six".