20112221220210 has 384 divisors, whose sum is σ = 64585904947200. Its totient is φ = 4499260178112.

The previous prime is 20112221220197. The next prime is 20112221220229. The reversal of 20112221220210 is 1202212221102.

It is a happy number.

20112221220210 is a `hidden beast` number, since 2 + 0 + 1 + 12 + 221 + 220 + 210 = 666.

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 191 ways as a sum of consecutive naturals, for example, 38917327 + ... + 39430733.

It is an arithmetic number, because the mean of its divisors is an integer number (168192460800).

Almost surely, 2^{20112221220210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20112221220210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32292952473600).

20112221220210 is an abundant number, since it is smaller than the sum of its proper divisors (44473683726990).

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

20112221220210 is an equidigital number, since it uses as much as digits as its factorization.

20112221220210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513497 (or 513471 counting only the distinct ones).

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

Adding to 20112221220210 its reverse (1202212221102), we get a palindrome (21314433441312).

The spelling of 20112221220210 in words is "twenty trillion, one hundred twelve billion, two hundred twenty-one million, two hundred twenty thousand, two hundred ten".