222012121221 has 24 divisors (see below), whose sum is σ = 350105150304. Its totient is φ = 134449774560.

The previous prime is 222012121217. The next prime is 222012121277. The reversal of 222012121221 is 122121210222.

It is a happy number.

It is not a de Polignac number, because 222012121221 - 2² = 222012121217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222012121194 and 222012121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222012121211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 728506 + ... + 987291.

It is an arithmetic number, because the mean of its divisors is an integer number (14587714596).

Almost surely, 2^222012121221 is an apocalyptic number.

It is an amenable number.

222012121221 is a deficient number, since it is larger than the sum of its proper divisors (128093029083).

222012121221 is a wasteful number, since it uses less digits than its factorization.

222012121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1717121 (or 1717118 counting only the distinct ones).

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

Adding to 222012121221 its reverse (122121210222), we get a palindrome (344133331443).

The spelling of 222012121221 in words is "two hundred twenty-two billion, twelve million, one hundred twenty-one thousand, two hundred twenty-one".