210211221220 has 432 divisors, whose sum is σ = 607258439424. Its totient is φ = 59799168000.

The previous prime is 210211221217. The next prime is 210211221251. The reversal of 210211221220 is 22122112012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 210211221194 and 210211221203.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 289148497 + ... + 289149223.

It is an arithmetic number, because the mean of its divisors is an integer number (1405690832).

Almost surely, 2^210211221220 is an apocalyptic number.

210211221220 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 210211221220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303629219712).

210211221220 is an abundant number, since it is smaller than the sum of its proper divisors (397047218204).

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

210211221220 is a wasteful number, since it uses less digits than its factorization.

210211221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892 (or 866 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 210211221220 its reverse (22122112012), we get a palindrome (232333333232).

The spelling of 210211221220 in words is "two hundred ten billion, two hundred eleven million, two hundred twenty-one thousand, two hundred twenty".