21324049494 has 64 divisors (see below), whose sum is σ = 48178202112. Its totient is φ = 6287101920.

The previous prime is 21324049471. The next prime is 21324049511. The reversal of 21324049494 is 49494042312.

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 in 31 ways as a sum of consecutive naturals, for example, 259399 + ... + 331565.

It is an arithmetic number, because the mean of its divisors is an integer number (752784408).

Almost surely, 2^21324049494 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21324049494, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24089101056).

21324049494 is an abundant number, since it is smaller than the sum of its proper divisors (26854152618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21324049494 is a wasteful number, since it uses less digits than its factorization.

21324049494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72242 (or 72220 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The spelling of 21324049494 in words is "twenty-one billion, three hundred twenty-four million, forty-nine thousand, four hundred ninety-four".