21232034434 has 16 divisors (see below), whose sum is σ = 36315426168. Its totient is φ = 9222964992.

The previous prime is 21232034429. The next prime is 21232034437. The reversal of 21232034434 is 43443023212.

It can be written as a sum of positive squares in 4 ways, for example, as 20359009225 + 873025209 = 142685^2 + 29547^2 .

It is not an unprimeable number, because it can be changed into a prime (21232034437) 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, 24017697 + ... + 24018580.

Almost surely, 2^21232034434 is an apocalyptic number.

21232034434 is a deficient number, since it is larger than the sum of its proper divisors (15083391734).

21232034434 is a wasteful number, since it uses less digits than its factorization.

21232034434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48036309.

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

Adding to 21232034434 its reverse (43443023212), we get a palindrome (64675057646).

The spelling of 21232034434 in words is "twenty-one billion, two hundred thirty-two million, thirty-four thousand, four hundred thirty-four".