212211661140 has 36 divisors (see below), whose sum is σ = 643708706004. Its totient is φ = 56589776256.

The previous prime is 212211661139. The next prime is 212211661159. The reversal of 212211661140 is 41166112212.

212211661140 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 1 + 1 + 6 + 611 + 40 = 666.

212211661140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 37275252624 + 174936408516 = 193068^2 + 418254^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 11 ways as a sum of consecutive naturals, for example, 589476657 + ... + 589477016.

It is an arithmetic number, because the mean of its divisors is an integer number (17880797389).

Almost surely, 2^212211661140 is an apocalyptic number.

212211661140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212211661140 is an abundant number, since it is smaller than the sum of its proper divisors (431497044864).

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

212211661140 is a wasteful number, since it uses less digits than its factorization.

212211661140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178953688 (or 1178953683 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

Adding to 212211661140 its reverse (41166112212), we get a palindrome (253377773352).

The spelling of 212211661140 in words is "two hundred twelve billion, two hundred eleven million, six hundred sixty-one thousand, one hundred forty".