212657140440 has 48 divisors (see below), whose sum is σ = 691135707600. Its totient is φ = 56708570688.

The previous prime is 212657140417. The next prime is 212657140441. The reversal of 212657140440 is 44041756212.

212657140440 is a `hidden beast` number, since 2 + 1 + 2 + 6 + 571 + 40 + 4 + 40 = 666.

212657140440 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 212657140395 and 212657140404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212657140441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 295356780 + ... + 295357499.

It is an arithmetic number, because the mean of its divisors is an integer number (14398660575).

Almost surely, 2^212657140440 is an apocalyptic number.

212657140440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212657140440 is an abundant number, since it is smaller than the sum of its proper divisors (478478567160).

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

212657140440 is a wasteful number, since it uses less digits than its factorization.

212657140440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590714296 (or 590714289 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

Adding to 212657140440 its reverse (44041756212), we get a palindrome (256698896652).

The spelling of 212657140440 in words is "two hundred twelve billion, six hundred fifty-seven million, one hundred forty thousand, four hundred forty".