21550522000 has 160 divisors (see below), whose sum is σ = 62688487680. Its totient is φ = 6999782400.

The previous prime is 21550521997. The next prime is 21550522003. The reversal of 21550522000 is 22505512.

It is an interprime number because it is at equal distance from previous prime (21550521997) and next prime (21550522003).

It is not an unprimeable number, because it can be changed into a prime (21550522003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 225492 + ... + 306508.

It is an arithmetic number, because the mean of its divisors is an integer number (391803048).

Almost surely, 2^21550522000 is an apocalyptic number.

21550522000 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 21550522000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31344243840).

21550522000 is an abundant number, since it is smaller than the sum of its proper divisors (41137965680).

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

21550522000 is a wasteful number, since it uses less digits than its factorization.

21550522000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81066 (or 81050 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The spelling of 21550522000 in words is "twenty-one billion, five hundred fifty million, five hundred twenty-two thousand".