211221131312 has 20 divisors (see below), whose sum is σ = 430779939480. Its totient is φ = 100052114688.

The previous prime is 211221131287. The next prime is 211221131339. The reversal of 211221131312 is 213131122112.

It is a super-2 number, since 2×211221131312² (a number of 23 digits) contains 22 as substring.

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, 347402873 + ... + 347403480.

It is an arithmetic number, because the mean of its divisors is an integer number (21538996974).

Almost surely, 2^211221131312 is an apocalyptic number.

It is an amenable number.

211221131312 is an abundant number, since it is smaller than the sum of its proper divisors (219558808168).

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

211221131312 is a wasteful number, since it uses less digits than its factorization.

211221131312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694806380 (or 694806374 counting only the distinct ones).

The product of its digits is 144, while the sum is 20.

Adding to 211221131312 its reverse (213131122112), we get a palindrome (424352253424).

The spelling of 211221131312 in words is "two hundred eleven billion, two hundred twenty-one million, one hundred thirty-one thousand, three hundred twelve".