21214423234 has 16 divisors (see below), whose sum is σ = 32255730360. Its totient is φ = 10463080320.

The previous prime is 21214423211. The next prime is 21214423247. The reversal of 21214423234 is 43232441212.

It can be written as a sum of positive squares in 4 ways, for example, as 12012817609 + 9201605625 = 109603^2 + 95925^2 .

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, 66609 + ... + 216484.

Almost surely, 2^21214423234 is an apocalyptic number.

21214423234 is a deficient number, since it is larger than the sum of its proper divisors (11041307126).

21214423234 is a wasteful number, since it uses less digits than its factorization.

21214423234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283605.

The product of its digits is 9216, while the sum is 28.

Adding to 21214423234 its reverse (43232441212), we get a palindrome (64446864446).

The spelling of 21214423234 in words is "twenty-one billion, two hundred fourteen million, four hundred twenty-three thousand, two hundred thirty-four".