21533055080 has 32 divisors (see below), whose sum is σ = 50012259840. Its totient is φ = 8335375680.

The previous prime is 21533055077. The next prime is 21533055119. The reversal of 21533055080 is 8055033512.

It is a super-2 number, since 2×21533055080² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8681444 + ... + 8683923.

It is an arithmetic number, because the mean of its divisors is an integer number (1562883120).

Almost surely, 2^21533055080 is an apocalyptic number.

21533055080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21533055080 is an abundant number, since it is smaller than the sum of its proper divisors (28479204760).

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

21533055080 is a wasteful number, since it uses less digits than its factorization.

21533055080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17365409 (or 17365405 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

Adding to 21533055080 its reverse (8055033512), we get a palindrome (29588088592).

The spelling of 21533055080 in words is "twenty-one billion, five hundred thirty-three million, fifty-five thousand, eighty".