21233024420 has 12 divisors (see below), whose sum is σ = 44589351324. Its totient is φ = 8493209760.

The previous prime is 21233024411. The next prime is 21233024437. The reversal of 21233024420 is 2442033212.

It can be written as a sum of positive squares in 2 ways, for example, as 10059688804 + 11173335616 = 100298^2 + 105704^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530825591 + ... + 530825630.

It is an arithmetic number, because the mean of its divisors is an integer number (3715779277).

Almost surely, 2^21233024420 is an apocalyptic number.

21233024420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21233024420 is an abundant number, since it is smaller than the sum of its proper divisors (23356326904).

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

21233024420 is a wasteful number, since it uses less digits than its factorization.

21233024420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061651230 (or 1061651228 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21233024420 its reverse (2442033212), we get a palindrome (23675057632).

The spelling of 21233024420 in words is "twenty-one billion, two hundred thirty-three million, twenty-four thousand, four hundred twenty".