21532233540 has 96 divisors (see below), whose sum is σ = 61243378560. Its totient is φ = 5651306496.

The previous prime is 21532233539. The next prime is 21532233571. The reversal of 21532233540 is 4533223512.

It is a super-2 number, since 2×21532233540² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21532233498 and 21532233507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8251756 + ... + 8254364.

It is an arithmetic number, because the mean of its divisors is an integer number (637951860).

Almost surely, 2^21532233540 is an apocalyptic number.

21532233540 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 21532233540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30621689280).

21532233540 is an abundant number, since it is smaller than the sum of its proper divisors (39711145020).

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

21532233540 is a wasteful number, since it uses less digits than its factorization.

21532233540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4741 (or 4739 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 30.

The spelling of 21532233540 in words is "twenty-one billion, five hundred thirty-two million, two hundred thirty-three thousand, five hundred forty".