21344430430 has 16 divisors (see below), whose sum is σ = 38632243104. Its totient is φ = 8490601440.

The previous prime is 21344430421. The next prime is 21344430449. The reversal of 21344430430 is 3403444312.

It is a super-2 number, since 2×21344430430² (a number of 21 digits) contains 22 as substring.

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, 5894442 + ... + 5898061.

It is an arithmetic number, because the mean of its divisors is an integer number (2414515194).

Almost surely, 2^21344430430 is an apocalyptic number.

21344430430 is a deficient number, since it is larger than the sum of its proper divisors (17287812674).

21344430430 is a wasteful number, since it uses less digits than its factorization.

21344430430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11792691.

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 21344430430 its reverse (3403444312), we get a palindrome (24747874742).

The spelling of 21344430430 in words is "twenty-one billion, three hundred forty-four million, four hundred thirty thousand, four hundred thirty".