221121202112 has 56 divisors (see below), whose sum is σ = 464754407040. Its totient is φ = 104022097920.

The previous prime is 221121202111. The next prime is 221121202123. The reversal of 221121202112 is 211202121122.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121202111) 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, 3363089 + ... + 3428207.

It is an arithmetic number, because the mean of its divisors is an integer number (8299185840).

Almost surely, 2^221121202112 is an apocalyptic number.

It is an amenable number.

221121202112 is an abundant number, since it is smaller than the sum of its proper divisors (243633204928).

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

221121202112 is a wasteful number, since it uses less digits than its factorization.

221121202112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68269 (or 68259 counting only the distinct ones).

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

Adding to 221121202112 its reverse (211202121122), we get a palindrome (432323323234).

The spelling of 221121202112 in words is "two hundred twenty-one billion, one hundred twenty-one million, two hundred two thousand, one hundred twelve".