21230321430 has 16 divisors (see below), whose sum is σ = 50952771504. Its totient is φ = 5661419040.

The previous prime is 21230321417. The next prime is 21230321443. The reversal of 21230321430 is 3412303212.

It is an interprime number because it is at equal distance from previous prime (21230321417) and next prime (21230321443).

It is a super-2 number, since 2×21230321430² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21230321397 and 21230321406.

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, 353838661 + ... + 353838720.

It is an arithmetic number, because the mean of its divisors is an integer number (3184548219).

Almost surely, 2^21230321430 is an apocalyptic number.

21230321430 is an abundant number, since it is smaller than the sum of its proper divisors (29722450074).

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

21230321430 is a wasteful number, since it uses less digits than its factorization.

21230321430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707677391.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21230321430 its reverse (3412303212), we get a palindrome (24642624642).

The spelling of 21230321430 in words is "twenty-one billion, two hundred thirty million, three hundred twenty-one thousand, four hundred thirty".