221221102012 has 6 divisors (see below), whose sum is σ = 387136928528. Its totient is φ = 110610551004.

The previous prime is 221221102001. The next prime is 221221102033. The reversal of 221221102012 is 210201122122.

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 as a sum of consecutive naturals, namely, 27652637748 + ... + 27652637755.

Almost surely, 2^221221102012 is an apocalyptic number.

It is an amenable number.

221221102012 is a deficient number, since it is larger than the sum of its proper divisors (165915826516).

221221102012 is a wasteful number, since it uses less digits than its factorization.

221221102012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55305275507 (or 55305275505 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221221102012 its reverse (210201122122), we get a palindrome (431422224134).

The spelling of 221221102012 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred two thousand, twelve".