221211112220212 has 12 divisors (see below), whose sum is σ = 388625747734980. Its totient is φ = 110175184295936.

The previous prime is 221211112220171. The next prime is 221211112220237. The reversal of 221211112220212 is 212022211112122.

It can be written as a sum of positive squares in 2 ways, for example, as 160664599025316 + 60546513194896 = 12675354^2 + 7781164^2 .

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, 107592952387 + ... + 107592954442.

It is an arithmetic number, because the mean of its divisors is an integer number (32385478977915).

Almost surely, 2^{221211112220212} is an apocalyptic number.

It is an amenable number.

221211112220212 is a deficient number, since it is larger than the sum of its proper divisors (167414635514768).

221211112220212 is a wasteful number, since it uses less digits than its factorization.

221211112220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215185907090 (or 215185907088 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 221211112220212 its reverse (212022211112122), we get a palindrome (433233323332334).

The spelling of 221211112220212 in words is "two hundred twenty-one trillion, two hundred eleven billion, one hundred twelve million, two hundred twenty thousand, two hundred twelve".