211221130331112 has 128 divisors (see below), whose sum is σ = 577603290009600. Its totient is φ = 63834678028800.

The previous prime is 211221130331051. The next prime is 211221130331209. The reversal of 211221130331112 is 211133031122112.

It is a super-2 number, since 2×211221130331112² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3710748412 + ... + 3710805332.

It is an arithmetic number, because the mean of its divisors is an integer number (4512525703200).

Almost surely, 2^{211221130331112} is an apocalyptic number.

211221130331112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211221130331112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288801645004800).

211221130331112 is an abundant number, since it is smaller than the sum of its proper divisors (366382159678488).

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

211221130331112 is a wasteful number, since it uses less digits than its factorization.

211221130331112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94407 (or 94403 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

Adding to 211221130331112 its reverse (211133031122112), we get a palindrome (422354161453224).

The spelling of 211221130331112 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred thirty million, three hundred thirty-one thousand, one hundred twelve".