210122221220 has 96 divisors (see below), whose sum is σ = 477552620160. Its totient is φ = 77367879680.

The previous prime is 210122221213. The next prime is 210122221223. The reversal of 210122221220 is 22122221012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (210122221223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3925235 + ... + 3978405.

It is an arithmetic number, because the mean of its divisors is an integer number (4974506460).

Almost surely, 2^210122221220 is an apocalyptic number.

210122221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 210122221220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238776310080).

210122221220 is an abundant number, since it is smaller than the sum of its proper divisors (267430398940).

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

210122221220 is a wasteful number, since it uses less digits than its factorization.

210122221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53453 (or 53451 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 210122221220 its reverse (22122221012), we get a palindrome (232244442232).

The spelling of 210122221220 in words is "two hundred ten billion, one hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty".