21331475000 has 96 divisors (see below), whose sum is σ = 54537915600. Its totient is φ = 7756800000.

The previous prime is 21331474979. The next prime is 21331475029. The reversal of 21331475000 is 57413312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 236216 + ... + 313784.

Almost surely, 2^21331475000 is an apocalyptic number.

21331475000 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 21331475000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27268957800).

21331475000 is an abundant number, since it is smaller than the sum of its proper divisors (33206440600).

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

21331475000 is an equidigital number, since it uses as much as digits as its factorization.

21331475000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77611 (or 77587 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

Adding to 21331475000 its reverse (57413312), we get a palindrome (21388888312).

The spelling of 21331475000 in words is "twenty-one billion, three hundred thirty-one million, four hundred seventy-five thousand".