212051507640 has 128 divisors (see below), whose sum is σ = 727218293760. Its totient is φ = 48456612864.

The previous prime is 212051507639. The next prime is 212051507677. The reversal of 212051507640 is 46705150212.

212051507640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3512349 + ... + 3572211.

It is an arithmetic number, because the mean of its divisors is an integer number (5681392920).

Almost surely, 2^212051507640 is an apocalyptic number.

212051507640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212051507640 is an abundant number, since it is smaller than the sum of its proper divisors (515166786120).

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

212051507640 is a wasteful number, since it uses less digits than its factorization.

212051507640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64101 (or 64097 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

Adding to 212051507640 its reverse (46705150212), we get a palindrome (258756657852).

The spelling of 212051507640 in words is "two hundred twelve billion, fifty-one million, five hundred seven thousand, six hundred forty".