21321104430 has 16 divisors (see below), whose sum is σ = 51170650704. Its totient is φ = 5685627840.

The previous prime is 21321104407. The next prime is 21321104447. The reversal of 21321104430 is 3440112312.

It is a super-2 number, since 2×21321104430² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21321104397 and 21321104406.

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, 355351711 + ... + 355351770.

It is an arithmetic number, because the mean of its divisors is an integer number (3198165669).

Almost surely, 2^21321104430 is an apocalyptic number.

21321104430 is an abundant number, since it is smaller than the sum of its proper divisors (29849546274).

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

21321104430 is a wasteful number, since it uses less digits than its factorization.

21321104430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710703491.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21321104430 its reverse (3440112312), we get a palindrome (24761216742).

It can be divided in two parts, 21321 and 104430, that added together give a triangular number (125751 = T₅₀₁).

The spelling of 21321104430 in words is "twenty-one billion, three hundred twenty-one million, one hundred four thousand, four hundred thirty".