210220121221 has 16 divisors (see below), whose sum is σ = 229892569920. Its totient is φ = 190641847680.

The previous prime is 210220121219. The next prime is 210220121227. The reversal of 210220121221 is 122121022012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 210220121221 - 2¹ = 210220121219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210220121195 and 210220121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210220121227) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 7578345 + ... + 7606033.

It is an arithmetic number, because the mean of its divisors is an integer number (14368285620).

Almost surely, 2^210220121221 is an apocalyptic number.

It is an amenable number.

210220121221 is a deficient number, since it is larger than the sum of its proper divisors (19672448699).

210220121221 is a wasteful number, since it uses less digits than its factorization.

210220121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29364.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 210220121221 its reverse (122121022012), we get a palindrome (332341143233).

It can be divided in two parts, 21022012 and 1221, that multiplied together give a palindrome (25667876652).

The spelling of 210220121221 in words is "two hundred ten billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twenty-one".