21243633446 has 32 divisors (see below), whose sum is σ = 37086221568. Its totient is φ = 8937851040.

The previous prime is 21243633443. The next prime is 21243633461. The reversal of 21243633446 is 64433634212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243633443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 422861 + ... + 470423.

It is an arithmetic number, because the mean of its divisors is an integer number (1158944424).

Almost surely, 2^21243633446 is an apocalyptic number.

21243633446 is a deficient number, since it is larger than the sum of its proper divisors (15842588122).

21243633446 is a wasteful number, since it uses less digits than its factorization.

21243633446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48156.

The product of its digits is 248832, while the sum is 38.

The spelling of 21243633446 in words is "twenty-one billion, two hundred forty-three million, six hundred thirty-three thousand, four hundred forty-six".