21214125430 has 16 divisors (see below), whose sum is σ = 38203760160. Its totient is φ = 8481575872.

The previous prime is 21214125421. The next prime is 21214125431. The reversal of 21214125430 is 3452141212.

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 = 21214125395 and 21214125404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214125431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 487375 + ... + 529114.

It is an arithmetic number, because the mean of its divisors is an integer number (2387735010).

Almost surely, 2^21214125430 is an apocalyptic number.

21214125430 is a deficient number, since it is larger than the sum of its proper divisors (16989634730).

21214125430 is a wasteful number, since it uses less digits than its factorization.

21214125430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018583.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21214125430 its reverse (3452141212), we get a palindrome (24666266642).

The spelling of 21214125430 in words is "twenty-one billion, two hundred fourteen million, one hundred twenty-five thousand, four hundred thirty".