21351224230 has 24 divisors (see below), whose sum is σ = 44706850128. Its totient is φ = 7320419568.

The previous prime is 21351224207. The next prime is 21351224261. The reversal of 21351224230 is 3242215312.

It is a super-2 number, since 2×21351224230² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21351224195 and 21351224204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21786474 + ... + 21787453.

It is an arithmetic number, because the mean of its divisors is an integer number (1862785422).

Almost surely, 2^21351224230 is an apocalyptic number.

21351224230 is an abundant number, since it is smaller than the sum of its proper divisors (23355625898).

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

21351224230 is a wasteful number, since it uses less digits than its factorization.

21351224230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43573948 (or 43573941 counting only the distinct ones).

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

Adding to 21351224230 its reverse (3242215312), we get a palindrome (24593439542).

The spelling of 21351224230 in words is "twenty-one billion, three hundred fifty-one million, two hundred twenty-four thousand, two hundred thirty".