211211101020210 has 128 divisors (see below), whose sum is σ = 526347390919680. Its totient is φ = 54177483768576.

The previous prime is 211211101020203. The next prime is 211211101020253. The reversal of 211211101020210 is 12020101112112.

It is a happy number.

It is a super-2 number, since 2×211211101020210² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 211211101020210.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1231702897 + ... + 1231874363.

It is an arithmetic number, because the mean of its divisors is an integer number (4112088991560).

Almost surely, 2^{211211101020210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211211101020210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263173695459840).

211211101020210 is an abundant number, since it is smaller than the sum of its proper divisors (315136289899470).

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

211211101020210 is a wasteful number, since it uses less digits than its factorization.

211211101020210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176792.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 211211101020210 its reverse (12020101112112), we get a palindrome (223231202132322).

The spelling of 211211101020210 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred one million, twenty thousand, two hundred ten".