21113112140 has 24 divisors (see below), whose sum is σ = 44387898912. Its totient is φ = 8435651840.

The previous prime is 21113112019. The next prime is 21113112143. The reversal of 21113112140 is 4121131112.

It is not an unprimeable number, because it can be changed into a prime (21113112143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 581504 + ... + 616743.

It is an arithmetic number, because the mean of its divisors is an integer number (1849495788).

Almost surely, 2^21113112140 is an apocalyptic number.

21113112140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113112140 is an abundant number, since it is smaller than the sum of its proper divisors (23274786772).

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

21113112140 is a wasteful number, since it uses less digits than its factorization.

21113112140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199137 (or 1199135 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21113112140 its reverse (4121131112), we get a palindrome (25234243252).

The spelling of 21113112140 in words is "twenty-one billion, one hundred thirteen million, one hundred twelve thousand, one hundred forty".