21451650324 has 96 divisors (see below), whose sum is σ = 55115450880. Its totient is φ = 6452517888.

The previous prime is 21451650323. The next prime is 21451650347. The reversal of 21451650324 is 42305615412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21451650323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12236232 + ... + 12237984.

It is an arithmetic number, because the mean of its divisors is an integer number (574119280).

Almost surely, 2^21451650324 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21451650324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27557725440).

21451650324 is an abundant number, since it is smaller than the sum of its proper divisors (33663800556).

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

21451650324 is a wasteful number, since it uses less digits than its factorization.

21451650324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3489 (or 3487 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The spelling of 21451650324 in words is "twenty-one billion, four hundred fifty-one million, six hundred fifty thousand, three hundred twenty-four".