210041222221 has 4 divisors (see below), whose sum is σ = 222396588252. Its totient is φ = 197685856192.

The previous prime is 210041222213. The next prime is 210041222257. The reversal of 210041222221 is 122222140012.

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 62243264196 + 147797958025 = 249486^2 + 384445^2 .

It is not a de Polignac number, because 210041222221 - 2³ = 210041222213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210041222291) 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, 6177682990 + ... + 6177683023.

It is an arithmetic number, because the mean of its divisors is an integer number (55599147063).

Almost surely, 2^210041222221 is an apocalyptic number.

It is an amenable number.

210041222221 is a deficient number, since it is larger than the sum of its proper divisors (12355366031).

210041222221 is a wasteful number, since it uses less digits than its factorization.

210041222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12355366030.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 210041222221 its reverse (122222140012), we get a palindrome (332263362233).

It can be divided in two parts, 21004 and 1222221, that added together give a square (1243225 = 1115²).

The spelling of 210041222221 in words is "two hundred ten billion, forty-one million, two hundred twenty-two thousand, two hundred twenty-one".