21267087000 has 128 divisors (see below), whose sum is σ = 66407178240. Its totient is φ = 5666620800.

The previous prime is 21267086957. The next prime is 21267087013. The reversal of 21267087000 is 78076212.

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, 5359017 + ... + 5362983.

It is an arithmetic number, because the mean of its divisors is an integer number (518806080).

Almost surely, 2^21267087000 is an apocalyptic number.

21267087000 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 21267087000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33203589120).

21267087000 is an abundant number, since it is smaller than the sum of its proper divisors (45140091240).

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

21267087000 is a wasteful number, since it uses less digits than its factorization.

21267087000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5778 (or 5764 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The spelling of 21267087000 in words is "twenty-one billion, two hundred sixty-seven million, eighty-seven thousand".