21120343134 has 64 divisors (see below), whose sum is σ = 46850372352. Its totient is φ = 6293548800.

The previous prime is 21120343129. The next prime is 21120343177. The reversal of 21120343134 is 43134302112.

It is a happy number.

21120343134 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2724504 + ... + 2732244.

It is an arithmetic number, because the mean of its divisors is an integer number (732037068).

Almost surely, 2^21120343134 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21120343134, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23425186176).

21120343134 is an abundant number, since it is smaller than the sum of its proper divisors (25730029218).

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

21120343134 is a wasteful number, since it uses less digits than its factorization.

21120343134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8441.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21120343134 its reverse (43134302112), we get a palindrome (64254645246).

The spelling of 21120343134 in words is "twenty-one billion, one hundred twenty million, three hundred forty-three thousand, one hundred thirty-four".