21100235140 has 24 divisors (see below), whose sum is σ = 44323780032. Its totient is φ = 8437563360.

The previous prime is 21100235087. The next prime is 21100235147. The reversal of 21100235140 is 4153200112.

It is not an unprimeable number, because it can be changed into a prime (21100235147) 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, 89064 + ... + 223903.

It is an arithmetic number, because the mean of its divisors is an integer number (1846824168).

Almost surely, 2^21100235140 is an apocalyptic number.

21100235140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100235140 is an abundant number, since it is smaller than the sum of its proper divisors (23223544892).

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

21100235140 is a wasteful number, since it uses less digits than its factorization.

21100235140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316347 (or 316345 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21100235140 its reverse (4153200112), we get a palindrome (25253435252).

The spelling of 21100235140 in words is "twenty-one billion, one hundred million, two hundred thirty-five thousand, one hundred forty".