211431440412 has 72 divisors (see below), whose sum is σ = 562881992400. Its totient is φ = 66732069888.

The previous prime is 211431440377. The next prime is 211431440419. The reversal of 211431440412 is 214044134112.

211431440412 is a `hidden beast` number, since 211 + 4 + 3 + 1 + 440 + 4 + 1 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211431440419) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1210258 + ... + 1373894.

It is an arithmetic number, because the mean of its divisors is an integer number (7817805450).

Almost surely, 2^211431440412 is an apocalyptic number.

It is an amenable number.

211431440412 is an abundant number, since it is smaller than the sum of its proper divisors (351450551988).

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

211431440412 is a wasteful number, since it uses less digits than its factorization.

211431440412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165555 (or 165550 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

Adding to 211431440412 its reverse (214044134112), we get a palindrome (425475574524).

The spelling of 211431440412 in words is "two hundred eleven billion, four hundred thirty-one million, four hundred forty thousand, four hundred twelve".