221222212011 has 18 divisors (see below), whose sum is σ = 328412929572. Its totient is φ = 143495480880.

The previous prime is 221222212009. The next prime is 221222212019. The reversal of 221222212011 is 110212222122.

It is a happy number.

221222212011 is a `hidden beast` number, since 221 + 22 + 221 + 201 + 1 = 666.

It is not a de Polignac number, because 221222212011 - 2¹ = 221222212009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221222212019) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8965125 + ... + 8989766.

It is an arithmetic number, because the mean of its divisors is an integer number (18245162754).

Almost surely, 2^221222212011 is an apocalyptic number.

221222212011 is a deficient number, since it is larger than the sum of its proper divisors (107190717561).

221222212011 is a wasteful number, since it uses less digits than its factorization.

221222212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17954971 (or 17954931 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221222212011 its reverse (110212222122), we get a palindrome (331434434133).

The spelling of 221222212011 in words is "two hundred twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, eleven".