221121100210 has 8 divisors (see below), whose sum is σ = 398017980396. Its totient is φ = 88448440080.

The previous prime is 221121100183. The next prime is 221121100237. The reversal of 221121100210 is 12001121122.

It is an interprime number because it is at equal distance from previous prime (221121100183) and next prime (221121100237).

It can be written as a sum of positive squares in 2 ways, for example, as 221090861209 + 30239001 = 470203^2 + 5499^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11056055001 + ... + 11056055020.

Almost surely, 2^221121100210 is an apocalyptic number.

221121100210 is a deficient number, since it is larger than the sum of its proper divisors (176896880186).

221121100210 is a wasteful number, since it uses less digits than its factorization.

221121100210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22112110028.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221121100210 its reverse (12001121122), we get a palindrome (233122221332).

The spelling of 221121100210 in words is "two hundred twenty-one billion, one hundred twenty-one million, one hundred thousand, two hundred ten".