21430443235 has 16 divisors (see below), whose sum is σ = 27126604800. Its totient is φ = 16208077536.

The previous prime is 21430443227. The next prime is 21430443247. The reversal of 21430443235 is 53234403412.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21430443235 - 2³ = 21430443227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21430443197 and 21430443206.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189969 + ... + 280978.

It is an arithmetic number, because the mean of its divisors is an integer number (1695412800).

Almost surely, 2^21430443235 is an apocalyptic number.

21430443235 is a deficient number, since it is larger than the sum of its proper divisors (5696161565).

21430443235 is a wasteful number, since it uses less digits than its factorization.

21430443235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471450.

The product of its (nonzero) digits is 34560, while the sum is 31.

Adding to 21430443235 its reverse (53234403412), we get a palindrome (74664846647).

The spelling of 21430443235 in words is "twenty-one billion, four hundred thirty million, four hundred forty-three thousand, two hundred thirty-five".