21343234430 has 16 divisors (see below), whose sum is σ = 43906082400. Its totient is φ = 7317680352.

The previous prime is 21343234417. The next prime is 21343234457. The reversal of 21343234430 is 3443234312.

It is a junction number, because it is equal to n+sod(n) for n = 21343234393 and 21343234402.

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, 152451605 + ... + 152451744.

It is an arithmetic number, because the mean of its divisors is an integer number (2744130150).

Almost surely, 2^21343234430 is an apocalyptic number.

21343234430 is an abundant number, since it is smaller than the sum of its proper divisors (22562847970).

21343234430 is a wasteful number, since it uses less digits than its factorization.

21343234430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304903363.

The product of its (nonzero) digits is 20736, while the sum is 29.

Adding to 21343234430 its reverse (3443234312), we get a palindrome (24786468742).

The spelling of 21343234430 in words is "twenty-one billion, three hundred forty-three million, two hundred thirty-four thousand, four hundred thirty".