221212112202 has 12 divisors (see below), whose sum is σ = 479292909810. Its totient is φ = 73737370728.

The previous prime is 221212112167. The next prime is 221212112237. The reversal of 221212112202 is 202211212122.

It is a happy number.

221212112202 is a `hidden beast` number, since 221 + 212 + 11 + 220 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (221212112167) and next prime (221212112237).

It can be written as a sum of positive squares in only one way, i.e., 198034790121 + 23177322081 = 445011^2 + 152241^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 12289561789 = 221212112202 / (2 + 2 + 1 + 2 + 1 + 2 + 1 + 1 + 2 + 2 + 0 + 2).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6144780877 + ... + 6144780912.

Almost surely, 2^221212112202 is an apocalyptic number.

221212112202 is an abundant number, since it is smaller than the sum of its proper divisors (258080797608).

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

221212112202 is a wasteful number, since it uses less digits than its factorization.

221212112202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12289561797 (or 12289561794 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221212112202 its reverse (202211212122), we get a palindrome (423423324324).

The spelling of 221212112202 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred twelve thousand, two hundred two".