21232345140 has 72 divisors (see below), whose sum is σ = 64911974400. Its totient is φ = 5617370304.

The previous prime is 21232345111. The next prime is 21232345151. The reversal of 21232345140 is 4154323212.

21232345140 is a `hidden beast` number, since 2 + 123 + 23 + 4 + 514 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 441540 + ... + 487259.

It is an arithmetic number, because the mean of its divisors is an integer number (901555200).

Almost surely, 2^21232345140 is an apocalyptic number.

21232345140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21232345140 is an abundant number, since it is smaller than the sum of its proper divisors (43679629260).

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

21232345140 is a wasteful number, since it uses less digits than its factorization.

21232345140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928941 (or 928936 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21232345140 its reverse (4154323212), we get a palindrome (25386668352).

The spelling of 21232345140 in words is "twenty-one billion, two hundred thirty-two million, three hundred forty-five thousand, one hundred forty".