21515333000 has 128 divisors (see below), whose sum is σ = 59394816000. Its totient is φ = 7138656000.

The previous prime is 21515332967. The next prime is 21515333009. The reversal of 21515333000 is 33351512.

It is not an unprimeable number, because it can be changed into a prime (21515333009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167426 + ... + 266574.

It is an arithmetic number, because the mean of its divisors is an integer number (464022000).

Almost surely, 2^21515333000 is an apocalyptic number.

21515333000 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 21515333000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29697408000).

21515333000 is an abundant number, since it is smaller than the sum of its proper divisors (37879483000).

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

21515333000 is a wasteful number, since it uses less digits than its factorization.

21515333000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99208 (or 99194 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 23.

Adding to 21515333000 its reverse (33351512), we get a palindrome (21548684512).

The spelling of 21515333000 in words is "twenty-one billion, five hundred fifteen million, three hundred thirty-three thousand".