210103221221 has 4 divisors (see below), whose sum is σ = 222462234252. Its totient is φ = 197744208192.

The previous prime is 210103221199. The next prime is 210103221233. The reversal of 210103221221 is 122122301012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 146412604321 + 63690616900 = 382639^2 + 252370^2 .

It is a cyclic number.

It is not a de Polignac number, because 210103221221 - 2²⁶ = 210036112357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 12359013013 = 210103221221 / (2 + 1 + 0 + 1 + 0 + 3 + 2 + 2 + 1 + 2 + 2 + 1).

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 210103221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210103221281) 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, 6179506490 + ... + 6179506523.

It is an arithmetic number, because the mean of its divisors is an integer number (55615558563).

Almost surely, 2^210103221221 is an apocalyptic number.

It is an amenable number.

210103221221 is a deficient number, since it is larger than the sum of its proper divisors (12359013031).

210103221221 is a wasteful number, since it uses less digits than its factorization.

210103221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12359013030.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 210103221221 its reverse (122122301012), we get a palindrome (332225522233).

The spelling of 210103221221 in words is "two hundred ten billion, one hundred three million, two hundred twenty-one thousand, two hundred twenty-one".