21338809000 has 64 divisors (see below), whose sum is σ = 51654704400. Its totient is φ = 8241184000.

The previous prime is 21338808991. The next prime is 21338809021. The reversal of 21338809000 is 90883312.

It can be written as a sum of positive squares in 8 ways, for example, as 74753316 + 21264055684 = 8646^2 + 145822^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 338911 + ... + 396910.

Almost surely, 2^21338809000 is an apocalyptic number.

21338809000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21338809000 is an abundant number, since it is smaller than the sum of its proper divisors (30315895400).

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

21338809000 is a wasteful number, since it uses less digits than its factorization.

21338809000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735871 (or 735857 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 21338809000 in words is "twenty-one billion, three hundred thirty-eight million, eight hundred nine thousand".