211944439540 has 12 divisors (see below), whose sum is σ = 445083323076. Its totient is φ = 84777775808.

The previous prime is 211944439501. The next prime is 211944439543. The reversal of 211944439540 is 45934449112.

It can be written as a sum of positive squares in 2 ways, for example, as 129631681936 + 82312757604 = 360044^2 + 286902^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211944439543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5298610969 + ... + 5298611008.

It is an arithmetic number, because the mean of its divisors is an integer number (37090276923).

Almost surely, 2^211944439540 is an apocalyptic number.

211944439540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211944439540 is an abundant number, since it is smaller than the sum of its proper divisors (233138883536).

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

211944439540 is a wasteful number, since it uses less digits than its factorization.

211944439540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10597221986 (or 10597221984 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 211944439540 in words is "two hundred eleven billion, nine hundred forty-four million, four hundred thirty-nine thousand, five hundred forty".