21205334134 has 16 divisors (see below), whose sum is σ = 32573334528. Its totient is φ = 10348786152.

The previous prime is 21205334119. The next prime is 21205334167. The reversal of 21205334134 is 43143350212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272844 + ... + 341839.

It is an arithmetic number, because the mean of its divisors is an integer number (2035833408).

Almost surely, 2^21205334134 is an apocalyptic number.

21205334134 is a deficient number, since it is larger than the sum of its proper divisors (11368000394).

21205334134 is a wasteful number, since it uses less digits than its factorization.

21205334134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615099.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 21205334134 its reverse (43143350212), we get a palindrome (64348684346).

The spelling of 21205334134 in words is "twenty-one billion, two hundred five million, three hundred thirty-four thousand, one hundred thirty-four".