221210220201212 has 96 divisors (see below), whose sum is σ = 442246407906240. Its totient is φ = 95893297920000.

The previous prime is 221210220201203. The next prime is 221210220201227. The reversal of 221210220201212 is 212102022012122.

It is a super-2 number, since 2×221210220201212² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52218248 + ... + 56295344.

It is an arithmetic number, because the mean of its divisors is an integer number (4606733415690).

Almost surely, 2^{221210220201212} is an apocalyptic number.

221210220201212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221210220201212 is a deficient number, since it is larger than the sum of its proper divisors (221036187705028).

221210220201212 is a wasteful number, since it uses less digits than its factorization.

221210220201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4077663 (or 4077661 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221210220201212 its reverse (212102022012122), we get a palindrome (433312242213334).

The spelling of 221210220201212 in words is "two hundred twenty-one trillion, two hundred ten billion, two hundred twenty million, two hundred one thousand, two hundred twelve".