221212012412 has 12 divisors (see below), whose sum is σ = 400470022680. Its totient is φ = 106792005936.

The previous prime is 221212012403. The next prime is 221212012429. The reversal of 221212012412 is 214210212122.

It is a happy number.

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, 953499938 + ... + 953500169.

It is an arithmetic number, because the mean of its divisors is an integer number (33372501890).

Almost surely, 2^221212012412 is an apocalyptic number.

It is an amenable number.

221212012412 is a deficient number, since it is larger than the sum of its proper divisors (179258010268).

221212012412 is a wasteful number, since it uses less digits than its factorization.

221212012412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1907000140 (or 1907000138 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221212012412 its reverse (214210212122), we get a palindrome (435422224534).

The spelling of 221212012412 in words is "two hundred twenty-one billion, two hundred twelve million, twelve thousand, four hundred twelve".