210220101221 has 8 divisors (see below), whose sum is σ = 226465171800. Its totient is φ = 193985644032.

The previous prime is 210220101193. The next prime is 210220101233. The reversal of 210220101221 is 122101022012.

It can be written as a sum of positive squares in 4 ways, for example, as 12074932996 + 198145168225 = 109886^2 + 445135^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210220101221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210220101196 and 210220101205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210220101281) 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 7 ways as a sum of consecutive naturals, for example, 2612180 + ... + 2691453.

It is an arithmetic number, because the mean of its divisors is an integer number (28308146475).

Almost surely, 2^210220101221 is an apocalyptic number.

It is an amenable number.

210220101221 is a deficient number, since it is larger than the sum of its proper divisors (16245070579).

210220101221 is a wasteful number, since it uses less digits than its factorization.

210220101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5306695.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 210220101221 its reverse (122101022012), we get a palindrome (332321123233).

The spelling of 210220101221 in words is "two hundred ten billion, two hundred twenty million, one hundred one thousand, two hundred twenty-one".