21130204034 has 4 divisors (see below), whose sum is σ = 31695306054. Its totient is φ = 10565102016.

The previous prime is 21130204031. The next prime is 21130204049. The reversal of 21130204034 is 43040203112.

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., 20945325625 + 184878409 = 144725^2 + 13597^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21130203997 and 21130204015.

It is not an unprimeable number, because it can be changed into a prime (21130204031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5282551007 + ... + 5282551010.

Almost surely, 2^21130204034 is an apocalyptic number.

21130204034 is a deficient number, since it is larger than the sum of its proper divisors (10565102020).

21130204034 is a wasteful number, since it uses less digits than its factorization.

21130204034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10565102019.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21130204034 its reverse (43040203112), we get a palindrome (64170407146).

The spelling of 21130204034 in words is "twenty-one billion, one hundred thirty million, two hundred four thousand, thirty-four".