221222012221 has 16 divisors (see below), whose sum is σ = 261575164800. Its totient is φ = 183057956928.

The previous prime is 221222012161. The next prime is 221222012251. The reversal of 221222012221 is 122210222122.

It is not a de Polignac number, because 221222012221 - 2²¹ = 221219915069 is a prime.

It is a super-2 number, since 2×221222012221² (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 (221222012251) 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, 1720071 + ... + 1844203.

It is an arithmetic number, because the mean of its divisors is an integer number (16348447800).

Almost surely, 2^221222012221 is an apocalyptic number.

It is an amenable number.

221222012221 is a deficient number, since it is larger than the sum of its proper divisors (40353152579).

221222012221 is a wasteful number, since it uses less digits than its factorization.

221222012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132948.

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

Adding to 221222012221 its reverse (122210222122), we get a palindrome (343432234343).

The spelling of 221222012221 in words is "two hundred twenty-one billion, two hundred twenty-two million, twelve thousand, two hundred twenty-one".