21913049446 has 4 divisors (see below), whose sum is σ = 32869574172. Its totient is φ = 10956524722.

The previous prime is 21913049437. The next prime is 21913049491. The reversal of 21913049446 is 64494031912.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5478262360 + ... + 5478262363.

It is an arithmetic number, because the mean of its divisors is an integer number (8217393543).

Almost surely, 2^21913049446 is an apocalyptic number.

21913049446 is a deficient number, since it is larger than the sum of its proper divisors (10956524726).

21913049446 is a wasteful number, since it uses less digits than its factorization.

21913049446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10956524725.

The product of its (nonzero) digits is 186624, while the sum is 43.

The spelling of 21913049446 in words is "twenty-one billion, nine hundred thirteen million, forty-nine thousand, four hundred forty-six".