210221100120221 has 4 divisors (see below), whose sum is σ = 210221129133600. Its totient is φ = 210221071106844.

The previous prime is 210221100120191. The next prime is 210221100120233. The reversal of 210221100120221 is 122021001122012.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210221100120221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210221100120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221100120821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6545120 + ... + 21523958.

It is an arithmetic number, because the mean of its divisors is an integer number (52555282283400).

Almost surely, 2^{210221100120221} is an apocalyptic number.

It is an amenable number.

210221100120221 is a deficient number, since it is larger than the sum of its proper divisors (29013379).

210221100120221 is a wasteful number, since it uses less digits than its factorization.

210221100120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29013378.

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

Adding to 210221100120221 its reverse (122021001122012), we get a palindrome (332242101242233).

The spelling of 210221100120221 in words is "two hundred ten trillion, two hundred twenty-one billion, one hundred million, one hundred twenty thousand, two hundred twenty-one".