210221220111 has 16 divisors (see below), whose sum is σ = 330670553088. Its totient is φ = 116251365600.

The previous prime is 210221220047. The next prime is 210221220203. The reversal of 210221220111 is 111022122012.

It is not a de Polignac number, because 210221220111 - 2⁶ = 210221220047 is a prime.

It is a super-2 number, since 2×210221220111² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221620111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161459580 + ... + 161460881.

It is an arithmetic number, because the mean of its divisors is an integer number (20666909568).

Almost surely, 2^210221220111 is an apocalyptic number.

210221220111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

210221220111 is a deficient number, since it is larger than the sum of its proper divisors (120449332977).

210221220111 is a wasteful number, since it uses less digits than its factorization.

210221220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322920502.

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

Adding to 210221220111 its reverse (111022122012), we get a palindrome (321243342123).

It can be divided in two parts, 21022122011 and 1, that added together give a palindrome (21022122012).

The spelling of 210221220111 in words is "two hundred ten billion, two hundred twenty-one million, two hundred twenty thousand, one hundred eleven".