221233212212 has 12 divisors (see below), whose sum is σ = 387163516740. Its totient is φ = 110615064576.

The previous prime is 221233212197. The next prime is 221233212227. The reversal of 221233212212 is 212212332122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (221233212197) and next prime (221233212227).

It can be written as a sum of positive squares in 2 ways, for example, as 105200327716 + 116032884496 = 324346^2 + 340636^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25037 + ... + 665652.

It is an arithmetic number, because the mean of its divisors is an integer number (32263626395).

Almost surely, 2^221233212212 is an apocalyptic number.

It is an amenable number.

221233212212 is a deficient number, since it is larger than the sum of its proper divisors (165930304528).

221233212212 is a wasteful number, since it uses less digits than its factorization.

221233212212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770770 (or 770768 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

Adding to 221233212212 its reverse (212212332122), we get a palindrome (433445544334).

The spelling of 221233212212 in words is "two hundred twenty-one billion, two hundred thirty-three million, two hundred twelve thousand, two hundred twelve".