211211221020210 has 192 divisors, whose sum is σ = 556554136320000. Its totient is φ = 55569717633024.

The previous prime is 211211221020199. The next prime is 211211221020257. The reversal of 211211221020210 is 12020122112112.

211211221020210 is a `hidden beast` number, since 2 + 1 + 1 + 211 + 221 + 0 + 20 + 210 = 666.

It is a super-2 number, since 2×211211221020210² (a number of 29 digits) contains 22 as substring.

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 95 ways as a sum of consecutive naturals, for example, 1342624419 + ... + 1342781721.

It is an arithmetic number, because the mean of its divisors is an integer number (2898719460000).

Almost surely, 2^{211211221020210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211211221020210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278277068160000).

211211221020210 is an abundant number, since it is smaller than the sum of its proper divisors (345342915299790).

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

211211221020210 is a wasteful number, since it uses less digits than its factorization.

211211221020210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158137 (or 158134 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 211211221020210 its reverse (12020122112112), we get a palindrome (223231343132322).

The spelling of 211211221020210 in words is "two hundred eleven trillion, two hundred eleven billion, two hundred twenty-one million, twenty thousand, two hundred ten".