21220112202210 has 48 divisors (see below), whose sum is σ = 55226972132280. Its totient is φ = 5653088340480.

The previous prime is 21220112202077. The next prime is 21220112202287. The reversal of 21220112202210 is 1220221102212.

It is a happy number.

21220112202210 is a `hidden beast` number, since 2 + 1 + 220 + 1 + 1 + 220 + 221 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 16371823456521 + 4848288745689 = 4046211^2 + 2201883^2 .

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 23 ways as a sum of consecutive naturals, for example, 116747161 + ... + 116928780.

Almost surely, 2^{21220112202210} is an apocalyptic number.

21220112202210 is an abundant number, since it is smaller than the sum of its proper divisors (34006859930070).

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

21220112202210 is a wasteful number, since it uses less digits than its factorization.

21220112202210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233676963 (or 233676960 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21220112202210 its reverse (1220221102212), we get a palindrome (22440333304422).

The spelling of 21220112202210 in words is "twenty-one trillion, two hundred twenty billion, one hundred twelve million, two hundred two thousand, two hundred ten".