21112453140 has 48 divisors (see below), whose sum is σ = 59360199360. Its totient is φ = 5606622720.

The previous prime is 21112453127. The next prime is 21112453177. The reversal of 21112453140 is 4135421112.

It is a self number, because there is not a number n which added to its sum of digits gives 21112453140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 715570 + ... + 744489.

It is an arithmetic number, because the mean of its divisors is an integer number (1236670820).

Almost surely, 2^21112453140 is an apocalyptic number.

21112453140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112453140 is an abundant number, since it is smaller than the sum of its proper divisors (38247746220).

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

21112453140 is a wasteful number, since it uses less digits than its factorization.

21112453140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460312 (or 1460310 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21112453140 its reverse (4135421112), we get a palindrome (25247874252).

The spelling of 21112453140 in words is "twenty-one billion, one hundred twelve million, four hundred fifty-three thousand, one hundred forty".