221211112201212 has 96 divisors (see below), whose sum is σ = 590548018959360. Its totient is φ = 63133364367360.

The previous prime is 221211112201171. The next prime is 221211112201223. The reversal of 221211112201212 is 212102211112122.

It is a super-2 number, since 2×221211112201212² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

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, 657069468 + ... + 657406044.

It is an arithmetic number, because the mean of its divisors is an integer number (6151541864160).

Almost surely, 2^{221211112201212} is an apocalyptic number.

It is an amenable number.

221211112201212 is an abundant number, since it is smaller than the sum of its proper divisors (369336906758148).

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

221211112201212 is a wasteful number, since it uses less digits than its factorization.

221211112201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345211 (or 345209 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 221211112201212 its reverse (212102211112122), we get a palindrome (433313323313334).

The spelling of 221211112201212 in words is "two hundred twenty-one trillion, two hundred eleven billion, one hundred twelve million, two hundred one thousand, two hundred twelve".