21130344430 has 32 divisors (see below), whose sum is σ = 42067406304. Its totient is φ = 7591107456.

The previous prime is 21130344427. The next prime is 21130344451. The reversal of 21130344430 is 3444303112.

It is a junction number, because it is equal to n+sod(n) for n = 21130344395 and 21130344404.

It is a congruent number.

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, 2191692 + ... + 2201311.

It is an arithmetic number, because the mean of its divisors is an integer number (1314606447).

Almost surely, 2^21130344430 is an apocalyptic number.

21130344430 is a deficient number, since it is larger than the sum of its proper divisors (20937061874).

21130344430 is a wasteful number, since it uses less digits than its factorization.

21130344430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4393060.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21130344430 its reverse (3444303112), we get a palindrome (24574647542).

The spelling of 21130344430 in words is "twenty-one billion, one hundred thirty million, three hundred forty-four thousand, four hundred thirty".