21230056420 has 24 divisors (see below), whose sum is σ = 44700768000. Its totient is φ = 8469613152.

The previous prime is 21230056411. The next prime is 21230056439. The reversal of 21230056420 is 2465003212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1392820 + ... + 1407979.

It is an arithmetic number, because the mean of its divisors is an integer number (1862532000).

Almost surely, 2^21230056420 is an apocalyptic number.

21230056420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230056420 is an abundant number, since it is smaller than the sum of its proper divisors (23470711580).

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

21230056420 is a wasteful number, since it uses less digits than its factorization.

21230056420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2801187 (or 2801185 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21230056420 its reverse (2465003212), we get a palindrome (23695059632).

The spelling of 21230056420 in words is "twenty-one billion, two hundred thirty million, fifty-six thousand, four hundred twenty".