21201130134 has 64 divisors (see below), whose sum is σ = 51045223680. Its totient is φ = 6496640640.

The previous prime is 21201130133. The next prime is 21201130169. The reversal of 21201130134 is 43103110212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201130133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 229072 + ... + 308019.

It is an arithmetic number, because the mean of its divisors is an integer number (797581620).

Almost surely, 2^21201130134 is an apocalyptic number.

21201130134 is an abundant number, since it is smaller than the sum of its proper divisors (29844093546).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21201130134 is a wasteful number, since it uses less digits than its factorization.

21201130134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537162 (or 537156 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21201130134 its reverse (43103110212), we get a palindrome (64304240346).

The spelling of 21201130134 in words is "twenty-one billion, two hundred one million, one hundred thirty thousand, one hundred thirty-four".