210201211221 has 4 divisors (see below), whose sum is σ = 280268281632. Its totient is φ = 140134140812.

The previous prime is 210201211189. The next prime is 210201211243. The reversal of 210201211221 is 122112102012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210201211221 - 2⁵ = 210201211189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210201211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210201211321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35033535201 + ... + 35033535206.

It is an arithmetic number, because the mean of its divisors is an integer number (70067070408).

Almost surely, 2^210201211221 is an apocalyptic number.

It is an amenable number.

210201211221 is a deficient number, since it is larger than the sum of its proper divisors (70067070411).

210201211221 is an equidigital number, since it uses as much as digits as its factorization.

210201211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70067070410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 210201211221 its reverse (122112102012), we get a palindrome (332313313233).

The spelling of 210201211221 in words is "two hundred ten billion, two hundred one million, two hundred eleven thousand, two hundred twenty-one".