221210121222 has 24 divisors (see below), whose sum is σ = 494749519680. Its totient is φ = 71358103440.

The previous prime is 221210121203. The next prime is 221210121227. The reversal of 221210121222 is 222121012122.

It is a happy number.

221210121222 is a `hidden beast` number, since 221 + 210 + 1 + 212 + 22 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 221210121195 and 221210121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221210121227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 198216397 + ... + 198217512.

It is an arithmetic number, because the mean of its divisors is an integer number (20614563320).

Almost surely, 2^221210121222 is an apocalyptic number.

221210121222 is an abundant number, since it is smaller than the sum of its proper divisors (273539398458).

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

221210121222 is a wasteful number, since it uses less digits than its factorization.

221210121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396433948 (or 396433945 counting only the distinct ones).

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

Adding to 221210121222 its reverse (222121012122), we get a palindrome (443331133344).

It can be divided in two parts, 22121012122 and 2, that multiplied together give a palindrome (44242024244).

The spelling of 221210121222 in words is "two hundred twenty-one billion, two hundred ten million, one hundred twenty-one thousand, two hundred twenty-two".