21130140234 has 64 divisors (see below), whose sum is σ = 50031717120. Its totient is φ = 5823713280.

The previous prime is 21130140151. The next prime is 21130140253. The reversal of 21130140234 is 43204103112.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 21130140234.

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, 84322 + ... + 222194.

It is an arithmetic number, because the mean of its divisors is an integer number (781745580).

Almost surely, 2^21130140234 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21130140234, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25015858560).

21130140234 is an abundant number, since it is smaller than the sum of its proper divisors (28901576886).

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

21130140234 is a wasteful number, since it uses less digits than its factorization.

21130140234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138015.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21130140234 its reverse (43204103112), we get a palindrome (64334243346).

The spelling of 21130140234 in words is "twenty-one billion, one hundred thirty million, one hundred forty thousand, two hundred thirty-four".