221021210112210 has 24 divisors (see below), whose sum is σ = 574655146291980. Its totient is φ = 58938989363232.

The previous prime is 221021210112193. The next prime is 221021210112221. The reversal of 221021210112210 is 12211012120122.

221021210112210 is a `hidden beast` number, since 2 + 210 + 21 + 210 + 1 + 1 + 221 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 207708424640649 + 13312785471561 = 14412093^2 + 3648669^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 1227895611645 + ... + 1227895611824.

Almost surely, 2^{221021210112210} is an apocalyptic number.

221021210112210 is an abundant number, since it is smaller than the sum of its proper divisors (353633936179770).

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

221021210112210 is a wasteful number, since it uses less digits than its factorization.

221021210112210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2455791223482 (or 2455791223479 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221021210112210 its reverse (12211012120122), we get a palindrome (233232222232332).

The spelling of 221021210112210 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred ten million, one hundred twelve thousand, two hundred ten".