21430331223 has 32 divisors (see below), whose sum is σ = 34704414720. Its totient is φ = 11482974720.

The previous prime is 21430331161. The next prime is 21430331233. The reversal of 21430331223 is 32213303412.

It is not a de Polignac number, because 21430331223 - 2⁶ = 21430331159 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21430331193 and 21430331202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430331233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14008 + ... + 207501.

It is an arithmetic number, because the mean of its divisors is an integer number (1084512960).

Almost surely, 2^21430331223 is an apocalyptic number.

21430331223 is a deficient number, since it is larger than the sum of its proper divisors (13274083497).

21430331223 is a wasteful number, since it uses less digits than its factorization.

21430331223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221807.

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 21430331223 its reverse (32213303412), we get a palindrome (53643634635).

The spelling of 21430331223 in words is "twenty-one billion, four hundred thirty million, three hundred thirty-one thousand, two hundred twenty-three".