21580871000 has 128 divisors (see below), whose sum is σ = 57583431360. Its totient is φ = 7499520000.

The previous prime is 21580870979. The next prime is 21580871021. The reversal of 21580871000 is 17808512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21580870979) and next prime (21580871021).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172175 + ... + 269825.

Almost surely, 2^21580871000 is an apocalyptic number.

21580871000 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 21580871000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28791715680).

21580871000 is an abundant number, since it is smaller than the sum of its proper divisors (36002560360).

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

21580871000 is a wasteful number, since it uses less digits than its factorization.

21580871000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97702 (or 97688 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 32.

The spelling of 21580871000 in words is "twenty-one billion, five hundred eighty million, eight hundred seventy-one thousand".