21034204011 has 40 divisors (see below), whose sum is σ = 33121088000. Its totient is φ = 13266342000.

The previous prime is 21034204003. The next prime is 21034204021. The reversal of 21034204011 is 11040243012.

21034204011 is a `hidden beast` number, since 210 + 34 + 20 + 401 + 1 = 666.

It is not a de Polignac number, because 21034204011 - 2³ = 21034204003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21034204021) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1146690 + ... + 1164888.

It is an arithmetic number, because the mean of its divisors is an integer number (828027200).

Almost surely, 2^21034204011 is an apocalyptic number.

21034204011 is a deficient number, since it is larger than the sum of its proper divisors (12086883989).

21034204011 is a wasteful number, since it uses less digits than its factorization.

21034204011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18981 (or 18972 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21034204011 its reverse (11040243012), we get a palindrome (32074447023).

The spelling of 21034204011 in words is "twenty-one billion, thirty-four million, two hundred four thousand, eleven".