221102121212 has 144 divisors (see below), whose sum is σ = 483534374400. Its totient is φ = 87942516480.

The previous prime is 221102121187. The next prime is 221102121241. The reversal of 221102121212 is 212121201122.

It is a super-2 number, since 2×221102121212² (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 47 ways as a sum of consecutive naturals, for example, 38536808 + ... + 38542544.

It is an arithmetic number, because the mean of its divisors is an integer number (3357877600).

Almost surely, 2^221102121212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221102121212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241767187200).

221102121212 is an abundant number, since it is smaller than the sum of its proper divisors (262432253188).

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

221102121212 is a wasteful number, since it uses less digits than its factorization.

221102121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5984 (or 5975 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221102121212 its reverse (212121201122), we get a palindrome (433223322334).

The spelling of 221102121212 in words is "two hundred twenty-one billion, one hundred two million, one hundred twenty-one thousand, two hundred twelve".