221000212121022 has 48 divisors (see below), whose sum is σ = 484216754898240. Its totient is φ = 72838598976000.

The previous prime is 221000212120999. The next prime is 221000212121057. The reversal of 221000212121022 is 220121212000122.

It is a happy number.

221000212121022 is a `hidden beast` number, since 221 + 0 + 0 + 0 + 212 + 1 + 210 + 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 = 221000212120986 and 221000212121004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 403047147 + ... + 403595097.

It is an arithmetic number, because the mean of its divisors is an integer number (10087849060380).

Almost surely, 2^{221000212121022} is an apocalyptic number.

221000212121022 is an abundant number, since it is smaller than the sum of its proper divisors (263216542777218).

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

221000212121022 is a wasteful number, since it uses less digits than its factorization.

221000212121022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799809 (or 799806 counting only the distinct ones).

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

Adding to 221000212121022 its reverse (220121212000122), we get a palindrome (441121424121144).

The spelling of 221000212121022 in words is "two hundred twenty-one trillion, two hundred twelve million, one hundred twenty-one thousand, twenty-two".