210220010121221 has 8 divisors (see below), whose sum is σ = 217470298636920. Its totient is φ = 202969809782208.

The previous prime is 210220010121203. The next prime is 210220010121239. The reversal of 210220010121221 is 122121010022012.

It is an interprime number because it is at equal distance from previous prime (210220010121203) and next prime (210220010121239).

It can be written as a sum of positive squares in 4 ways, for example, as 76586756920996 + 133633253200225 = 8751386^2 + 11559985^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 210220010121221 - 2⁴² = 205821963610117 is a prime.

It is a super-2 number, since 2×210220010121221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 210220010121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210220010121241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17175566 + ... + 26747711.

It is an arithmetic number, because the mean of its divisors is an integer number (27183787329615).

Almost surely, 2^{210220010121221} is an apocalyptic number.

It is an amenable number.

210220010121221 is a deficient number, since it is larger than the sum of its proper divisors (7250288515699).

210220010121221 is a wasteful number, since it uses less digits than its factorization.

210220010121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44088343.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 210220010121221 its reverse (122121010022012), we get a palindrome (332341020143233).

The spelling of 210220010121221 in words is "two hundred ten trillion, two hundred twenty billion, ten million, one hundred twenty-one thousand, two hundred twenty-one".