21384545000 has 320 divisors, whose sum is σ = 63158282880. Its totient is φ = 6604416000.

The previous prime is 21384544999. The next prime is 21384545071. The reversal of 21384545000 is 54548312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 19564454 + ... + 19565546.

It is an arithmetic number, because the mean of its divisors is an integer number (197369634).

Almost surely, 2^21384545000 is an apocalyptic number.

21384545000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21384545000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31579141440).

21384545000 is an abundant number, since it is smaller than the sum of its proper divisors (41773737880).

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

21384545000 is a wasteful number, since it uses less digits than its factorization.

21384545000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182 (or 1163 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The spelling of 21384545000 in words is "twenty-one billion, three hundred eighty-four million, five hundred forty-five thousand".