21013434034 has 4 divisors (see below), whose sum is σ = 31520151054. Its totient is φ = 10506717016.

The previous prime is 21013434031. The next prime is 21013434067. The reversal of 21013434034 is 43043431012.

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., 16939803409 + 4073630625 = 130153^2 + 63825^2 .

It is not an unprimeable number, because it can be changed into a prime (21013434031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5253358507 + ... + 5253358510.

Almost surely, 2^21013434034 is an apocalyptic number.

21013434034 is a deficient number, since it is larger than the sum of its proper divisors (10506717020).

21013434034 is a wasteful number, since it uses less digits than its factorization.

21013434034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10506717019.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21013434034 its reverse (43043431012), we get a palindrome (64056865046).

The spelling of 21013434034 in words is "twenty-one billion, thirteen million, four hundred thirty-four thousand, thirty-four".