211220222221 has 16 divisors (see below), whose sum is σ = 215016364800. Its totient is φ = 207453774528.

The previous prime is 211220222189. The next prime is 211220222261. The reversal of 211220222221 is 122222022112.

It is a cyclic number.

It is not a de Polignac number, because 211220222221 - 2⁵ = 211220222189 is a prime.

It is a super-2 number, since 2×211220222221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220222261) 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, 23640471 + ... + 23649403.

It is an arithmetic number, because the mean of its divisors is an integer number (13438522800).

Almost surely, 2^211220222221 is an apocalyptic number.

It is an amenable number.

211220222221 is a deficient number, since it is larger than the sum of its proper divisors (3796142579).

211220222221 is a wasteful number, since it uses less digits than its factorization.

211220222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10548.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 211220222221 its reverse (122222022112), we get a palindrome (333442244333).

The spelling of 211220222221 in words is "two hundred eleven billion, two hundred twenty million, two hundred twenty-two thousand, two hundred twenty-one".