21232342420 has 24 divisors (see below), whose sum is σ = 44757465984. Its totient is φ = 8460642336.

The previous prime is 21232342409. The next prime is 21232342493. The reversal of 21232342420 is 2424323212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2013024 + ... + 2023543.

It is an arithmetic number, because the mean of its divisors is an integer number (1864894416).

Almost surely, 2^21232342420 is an apocalyptic number.

21232342420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21232342420 is an abundant number, since it is smaller than the sum of its proper divisors (23525123564).

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

21232342420 is a wasteful number, since it uses less digits than its factorization.

21232342420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4036839 (or 4036837 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21232342420 its reverse (2424323212), we get a palindrome (23656665632).

The spelling of 21232342420 in words is "twenty-one billion, two hundred thirty-two million, three hundred forty-two thousand, four hundred twenty".