221201021210 has 16 divisors (see below), whose sum is σ = 428789672136. Its totient is φ = 81674223168.

The previous prime is 221201021207. The next prime is 221201021213. The reversal of 221201021210 is 12120102122.

221201021210 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221201021207) and next prime (221201021213).

It can be written as a sum of positive squares in 4 ways, for example, as 55587021361 + 165613999849 = 235769^2 + 406957^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221201021213) 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, 850773029 + ... + 850773288.

Almost surely, 2^221201021210 is an apocalyptic number.

221201021210 is a deficient number, since it is larger than the sum of its proper divisors (207588650926).

221201021210 is a wasteful number, since it uses less digits than its factorization.

221201021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701546337.

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

Adding to 221201021210 its reverse (12120102122), we get a palindrome (233321123332).

The spelling of 221201021210 in words is "two hundred twenty-one billion, two hundred one million, twenty-one thousand, two hundred ten".