21233323240 has 64 divisors (see below), whose sum is σ = 49591861200. Its totient is φ = 8172337152.

The previous prime is 21233323231. The next prime is 21233323249. The reversal of 21233323240 is 4232333212.

It is an interprime number because it is at equal distance from previous prime (21233323231) and next prime (21233323249).

It can be written as a sum of positive squares in 8 ways, for example, as 15297237124 + 5936086116 = 123682^2 + 77046^2 .

It is not an unprimeable number, because it can be changed into a prime (21233323249) 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, 308644 + ... + 371116.

Almost surely, 2^21233323240 is an apocalyptic number.

21233323240 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 21233323240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24795930600).

21233323240 is an abundant number, since it is smaller than the sum of its proper divisors (28358537960).

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

21233323240 is a wasteful number, since it uses less digits than its factorization.

21233323240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62806 (or 62802 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 25.

Adding to 21233323240 its reverse (4232333212), we get a palindrome (25465656452).

The spelling of 21233323240 in words is "twenty-one billion, two hundred thirty-three million, three hundred twenty-three thousand, two hundred forty".