21100340140 has 48 divisors (see below), whose sum is σ = 48581971200. Its totient is φ = 7634278080.

The previous prime is 21100340117. The next prime is 21100340141. The reversal of 21100340140 is 4104300112.

It is not an unprimeable number, because it can be changed into a prime (21100340141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197202 + ... + 284761.

It is an arithmetic number, because the mean of its divisors is an integer number (1012124400).

Almost surely, 2^21100340140 is an apocalyptic number.

21100340140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100340140 is an abundant number, since it is smaller than the sum of its proper divisors (27481631060).

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

21100340140 is a wasteful number, since it uses less digits than its factorization.

21100340140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482182 (or 482180 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21100340140 its reverse (4104300112), we get a palindrome (25204640252).

The spelling of 21100340140 in words is "twenty-one billion, one hundred million, three hundred forty thousand, one hundred forty".