221021202122 has 24 divisors (see below), whose sum is σ = 385708920804. Its totient is φ = 94711220352.

The previous prime is 221021202121. The next prime is 221021202211. The reversal of 221021202122 is 221202120122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 217453409761 + 3567792361 = 466319^2 + 59731^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221021202122.

It is not an unprimeable number, because it can be changed into a prime (221021202121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 645008 + ... + 926324.

Almost surely, 2^221021202122 is an apocalyptic number.

221021202122 is a deficient number, since it is larger than the sum of its proper divisors (164687718682).

221021202122 is a wasteful number, since it uses less digits than its factorization.

221021202122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289350 (or 289343 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221021202122 its reverse (221202120122), we get a palindrome (442223322244).

The spelling of 221021202122 in words is "two hundred twenty-one billion, twenty-one million, two hundred two thousand, one hundred twenty-two".