21034004234 has 4 divisors (see below), whose sum is σ = 31551006354. Its totient is φ = 10517002116.

The previous prime is 21034004209. The next prime is 21034004261. The reversal of 21034004234 is 43240043012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16706338009 + 4327666225 = 129253^2 + 65785^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5258501057 + ... + 5258501060.

Almost surely, 2^21034004234 is an apocalyptic number.

21034004234 is a deficient number, since it is larger than the sum of its proper divisors (10517002120).

21034004234 is a wasteful number, since it uses less digits than its factorization.

21034004234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10517002119.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21034004234 its reverse (43240043012), we get a palindrome (64274047246).

The spelling of 21034004234 in words is "twenty-one billion, thirty-four million, four thousand, two hundred thirty-four".