211221133312 has 48 divisors (see below), whose sum is σ = 482673325680. Its totient is φ = 90523336704.

The previous prime is 211221133283. The next prime is 211221133337. The reversal of 211221133312 is 213331122112.

It is a super-2 number, since 2×211221133312² (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, 7352473 + ... + 7381144.

It is an arithmetic number, because the mean of its divisors is an integer number (10055694285).

Almost surely, 2^211221133312 is an apocalyptic number.

It is an amenable number.

211221133312 is an abundant number, since it is smaller than the sum of its proper divisors (271452192368).

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

211221133312 is an equidigital number, since it uses as much as digits as its factorization.

211221133312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14733646 (or 14733626 counting only the distinct ones).

The product of its digits is 432, while the sum is 22.

Adding to 211221133312 its reverse (213331122112), we get a palindrome (424552255424).

The spelling of 211221133312 in words is "two hundred eleven billion, two hundred twenty-one million, one hundred thirty-three thousand, three hundred twelve".