21587229000 has 640 divisors, whose sum is σ = 81523933920. Its totient is φ = 5308416000.

The previous prime is 21587228981. The next prime is 21587229007. The reversal of 21587229000 is 92278512.

It can be written as a sum of positive squares in 16 ways, for example, as 29354724 + 21557874276 = 5418^2 + 146826^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21587229007) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 83996872 + ... + 83997128.

Almost surely, 2^21587229000 is an apocalyptic number.

21587229000 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 21587229000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40761966960).

21587229000 is an abundant number, since it is smaller than the sum of its proper divisors (59936704920).

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

21587229000 is a wasteful number, since it uses less digits than its factorization.

21587229000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 345 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 21587229000 in words is "twenty-one billion, five hundred eighty-seven million, two hundred twenty-nine thousand".