211221120210 has 16 divisors (see below), whose sum is σ = 506930688576. Its totient is φ = 56325632048.

The previous prime is 211221120203. The next prime is 211221120217. The reversal of 211221120210 is 12021122112.

It is an interprime number because it is at equal distance from previous prime (211221120203) and next prime (211221120217).

It is a super-2 number, since 2×211221120210² (a number of 23 digits) contains 22 as substring.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 211221120210.

It is not an unprimeable number, because it can be changed into a prime (211221120217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3520351974 + ... + 3520352033.

It is an arithmetic number, because the mean of its divisors is an integer number (31683168036).

Almost surely, 2^211221120210 is an apocalyptic number.

211221120210 is an abundant number, since it is smaller than the sum of its proper divisors (295709568366).

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

211221120210 is a wasteful number, since it uses less digits than its factorization.

211221120210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7040704017.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 211221120210 its reverse (12021122112), we get a palindrome (223242242322).

The spelling of 211221120210 in words is "two hundred eleven billion, two hundred twenty-one million, one hundred twenty thousand, two hundred ten".