211343231220 has 96 divisors (see below), whose sum is σ = 673625272320. Its totient is φ = 49007122560.

The previous prime is 211343231213. The next prime is 211343231249. The reversal of 211343231220 is 22132343112.

It is a super-2 number, since 2×211343231220² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6946060 + ... + 6976419.

It is an arithmetic number, because the mean of its divisors is an integer number (7016929920).

Almost surely, 2^211343231220 is an apocalyptic number.

211343231220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211343231220 is an abundant number, since it is smaller than the sum of its proper divisors (462282041100).

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

211343231220 is a wasteful number, since it uses less digits than its factorization.

211343231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13922525 (or 13922523 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 211343231220 its reverse (22132343112), we get a palindrome (233475574332).

The spelling of 211343231220 in words is "two hundred eleven billion, three hundred forty-three million, two hundred thirty-one thousand, two hundred twenty".