221211202112 has 56 divisors (see below), whose sum is σ = 463527891840. Its totient is φ = 104453521920.

The previous prime is 221211202063. The next prime is 221211202117. The reversal of 221211202112 is 211202112122.

It is a super-2 number, since 2×221211202112² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221211202117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98537 + ... + 672407.

Almost surely, 2^221211202112 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 221211202112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231763945920).

221211202112 is an abundant number, since it is smaller than the sum of its proper divisors (242316689728).

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

221211202112 is a wasteful number, since it uses less digits than its factorization.

221211202112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574219 (or 574209 counting only the distinct ones).

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

Adding to 221211202112 its reverse (211202112122), we get a palindrome (432413314234).

The spelling of 221211202112 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred two thousand, one hundred twelve".