221222012 has 12 divisors (see below), whose sum is σ = 422333016. Its totient is φ = 100555440.

The previous prime is 221222011. The next prime is 221222039. The reversal of 221222012 is 210222122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2513843 + ... + 2513930.

It is an arithmetic number, because the mean of its divisors is an integer number (35194418).

Almost surely, 2^221222012 is an apocalyptic number.

221222012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221222012 is a deficient number, since it is larger than the sum of its proper divisors (201111004).

221222012 is a wasteful number, since it uses less digits than its factorization.

221222012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5027788 (or 5027786 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 221222012 is about 14873.5339445607. The cubic root of 221222012 is about 604.7967461484.

Adding to 221222012 its reverse (210222122), we get a palindrome (431444134).

The spelling of 221222012 in words is "two hundred twenty-one million, two hundred twenty-two thousand, twelve".