221211112220210 has 24 divisors (see below), whose sum is σ = 463188981915180. Its totient is φ = 75843809903904.

The previous prime is 221211112220171. The next prime is 221211112220237. The reversal of 221211112220210 is 12022211112122.

It can be written as a sum of positive squares in 2 ways, for example, as 220223730163969 + 987382056241 = 14839937^2 + 993671^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 225725624225 + ... + 225725625204.

Almost surely, 2^{221211112220210} is an apocalyptic number.

221211112220210 is an abundant number, since it is smaller than the sum of its proper divisors (241977869694970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221211112220210 is a wasteful number, since it uses less digits than its factorization.

221211112220210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451451249450 (or 451451249443 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221211112220210 its reverse (12022211112122), we get a palindrome (233233323332332).

The spelling of 221211112220210 in words is "two hundred twenty-one trillion, two hundred eleven billion, one hundred twelve million, two hundred twenty thousand, two hundred ten".