211212440440 has 64 divisors (see below), whose sum is σ = 478926806400. Its totient is φ = 83828124288.

The previous prime is 211212440437. The next prime is 211212440441. The reversal of 211212440440 is 44044212112.

It is a happy number.

211212440440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×211212440440² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212440441) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 10370347 + ... + 10390693.

It is an arithmetic number, because the mean of its divisors is an integer number (7483231350).

Almost surely, 2^211212440440 is an apocalyptic number.

211212440440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211212440440 is an abundant number, since it is smaller than the sum of its proper divisors (267714365960).

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

211212440440 is a wasteful number, since it uses less digits than its factorization.

211212440440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22364 (or 22360 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 211212440440 its reverse (44044212112), we get a palindrome (255256652552).

The spelling of 211212440440 in words is "two hundred eleven billion, two hundred twelve million, four hundred forty thousand, four hundred forty".