21130113240 has 48 divisors (see below), whose sum is σ = 68672869200. Its totient is φ = 5634696768.

The previous prime is 21130113203. The next prime is 21130113247. The reversal of 21130113240 is 4231103112.

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 (21130113247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29347020 + ... + 29347739.

It is an arithmetic number, because the mean of its divisors is an integer number (1430684775).

Almost surely, 2^21130113240 is an apocalyptic number.

21130113240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21130113240 is an abundant number, since it is smaller than the sum of its proper divisors (47542755960).

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

21130113240 is a wasteful number, since it uses less digits than its factorization.

21130113240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58694776 (or 58694769 counting only the distinct ones).

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

Adding to 21130113240 its reverse (4231103112), we get a palindrome (25361216352).

The spelling of 21130113240 in words is "twenty-one billion, one hundred thirty million, one hundred thirteen thousand, two hundred forty".