21344113140 has 48 divisors (see below), whose sum is σ = 68301163392. Its totient is φ = 4878654336.

The previous prime is 21344113117. The next prime is 21344113181. The reversal of 21344113140 is 4131144312.

It is a self number, because there is not a number n which added to its sum of digits gives 21344113140.

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, 25409239 + ... + 25410078.

It is an arithmetic number, because the mean of its divisors is an integer number (1422940904).

Almost surely, 2^21344113140 is an apocalyptic number.

21344113140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21344113140 is an abundant number, since it is smaller than the sum of its proper divisors (46957050252).

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

21344113140 is a wasteful number, since it uses less digits than its factorization.

21344113140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50819336 (or 50819334 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21344113140 its reverse (4131144312), we get a palindrome (25475257452).

The spelling of 21344113140 in words is "twenty-one billion, three hundred forty-four million, one hundred thirteen thousand, one hundred forty".