21233582520 has 64 divisors (see below), whose sum is σ = 66470353920. Its totient is φ = 5416101504.

The previous prime is 21233582509. The next prime is 21233582527. The reversal of 21233582520 is 2528533212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233582527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3843904 + ... + 3849423.

It is an arithmetic number, because the mean of its divisors is an integer number (1038599280).

Almost surely, 2^21233582520 is an apocalyptic number.

21233582520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21233582520 is an abundant number, since it is smaller than the sum of its proper divisors (45236771400).

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

21233582520 is a wasteful number, since it uses less digits than its factorization.

21233582520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7693364 (or 7693360 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The spelling of 21233582520 in words is "twenty-one billion, two hundred thirty-three million, five hundred eighty-two thousand, five hundred twenty".