21202233240 has 128 divisors (see below), whose sum is σ = 65230038720. Its totient is φ = 5509939200.

The previous prime is 21202233203. The next prime is 21202233277. The reversal of 21202233240 is 4233220212.

It is an interprime number because it is at equal distance from previous prime (21202233203) and next prime (21202233277).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5985870 + ... + 5989410.

Almost surely, 2^21202233240 is an apocalyptic number.

21202233240 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 21202233240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32615019360).

21202233240 is an abundant number, since it is smaller than the sum of its proper divisors (44027805480).

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

21202233240 is a wasteful number, since it uses less digits than its factorization.

21202233240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4813 (or 4809 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21202233240 its reverse (4233220212), we get a palindrome (25435453452).

The spelling of 21202233240 in words is "twenty-one billion, two hundred two million, two hundred thirty-three thousand, two hundred forty".