211242012440 has 16 divisors (see below), whose sum is σ = 475294528080. Its totient is φ = 84496804960.

The previous prime is 211242012437. The next prime is 211242012451. The reversal of 211242012440 is 44210242112.

It is a super-2 number, since 2×211242012440² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2640525116 + ... + 2640525195.

It is an arithmetic number, because the mean of its divisors is an integer number (29705908005).

Almost surely, 2^211242012440 is an apocalyptic number.

211242012440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211242012440 is an abundant number, since it is smaller than the sum of its proper divisors (264052515640).

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

211242012440 is a wasteful number, since it uses less digits than its factorization.

211242012440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5281050322 (or 5281050318 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 211242012440 its reverse (44210242112), we get a palindrome (255452254552).

The spelling of 211242012440 in words is "two hundred eleven billion, two hundred forty-two million, twelve thousand, four hundred forty".