21234134422 has 16 divisors (see below), whose sum is σ = 32156358480. Its totient is φ = 10515484672.

The previous prime is 21234134419. The next prime is 21234134429. The reversal of 21234134422 is 22443143212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234134429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285093 + ... + 351775.

It is an arithmetic number, because the mean of its divisors is an integer number (2009772405).

Almost surely, 2^21234134422 is an apocalyptic number.

21234134422 is a deficient number, since it is larger than the sum of its proper divisors (10922224058).

21234134422 is a wasteful number, since it uses less digits than its factorization.

21234134422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68207.

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

Adding to 21234134422 its reverse (22443143212), we get a palindrome (43677277634).

The spelling of 21234134422 in words is "twenty-one billion, two hundred thirty-four million, one hundred thirty-four thousand, four hundred twenty-two".