221210222212120 has 16 divisors (see below), whose sum is σ = 497722999977360. Its totient is φ = 88484088884832.

The previous prime is 221210222212117. The next prime is 221210222212163. The reversal of 221210222212120 is 21212222012122.

It is a super-2 number, since 2×221210222212120² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221210222212091 and 221210222212100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2765127777612 + ... + 2765127777691.

It is an arithmetic number, because the mean of its divisors is an integer number (31107687498585).

Almost surely, 2^{221210222212120} is an apocalyptic number.

221210222212120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221210222212120 is an abundant number, since it is smaller than the sum of its proper divisors (276512777765240).

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

221210222212120 is a wasteful number, since it uses less digits than its factorization.

221210222212120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5530255555314 (or 5530255555310 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 221210222212120 its reverse (21212222012122), we get a palindrome (242422444224242).

The spelling of 221210222212120 in words is "two hundred twenty-one trillion, two hundred ten billion, two hundred twenty-two million, two hundred twelve thousand, one hundred twenty".