210000011221220 has 96 divisors (see below), whose sum is σ = 485084431835136. Its totient is φ = 76360879330560.

The previous prime is 210000011221177. The next prime is 210000011221229. The reversal of 210000011221220 is 22122110000012.

It is a junction number, because it is equal to n+sod(n) for n = 210000011221195 and 210000011221204.

It is not an unprimeable number, because it can be changed into a prime (210000011221229) 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, 825971357 + ... + 826225563.

It is an arithmetic number, because the mean of its divisors is an integer number (5052962831616).

Almost surely, 2^{210000011221220} is an apocalyptic number.

210000011221220 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 210000011221220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242542215917568).

210000011221220 is an abundant number, since it is smaller than the sum of its proper divisors (275084420613916).

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

210000011221220 is a wasteful number, since it uses less digits than its factorization.

210000011221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285282 (or 285258 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 210000011221220 its reverse (22122110000012), we get a palindrome (232122121221232).

The spelling of 210000011221220 in words is "two hundred ten trillion, eleven million, two hundred twenty-one thousand, two hundred twenty".