21424360646 has 16 divisors (see below), whose sum is σ = 34672576848. Its totient is φ = 9869882400.

The previous prime is 21424360627. The next prime is 21424360691. The reversal of 21424360646 is 64606342412.

21424360646 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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, 747500 + ... + 775631.

It is an arithmetic number, because the mean of its divisors is an integer number (2167036053).

Almost surely, 2^21424360646 is an apocalyptic number.

21424360646 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21424360646 is a deficient number, since it is larger than the sum of its proper divisors (13248216202).

21424360646 is a wasteful number, since it uses less digits than its factorization.

21424360646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1523687.

The product of its (nonzero) digits is 165888, while the sum is 38.

The spelling of 21424360646 in words is "twenty-one billion, four hundred twenty-four million, three hundred sixty thousand, six hundred forty-six".