21385319000 has 256 divisors, whose sum is σ = 53927976960. Its totient is φ = 7922880000.

The previous prime is 21385318993. The next prime is 21385319051. The reversal of 21385319000 is 91358312.

It is a super-2 number, since 2×21385319000² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 81312869 + ... + 81313131.

It is an arithmetic number, because the mean of its divisors is an integer number (210656160).

Almost surely, 2^21385319000 is an apocalyptic number.

21385319000 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 21385319000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26963988480).

21385319000 is an abundant number, since it is smaller than the sum of its proper divisors (32542657960).

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

21385319000 is a wasteful number, since it uses less digits than its factorization.

21385319000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The spelling of 21385319000 in words is "twenty-one billion, three hundred eighty-five million, three hundred nineteen thousand".