221211220012 has 12 divisors (see below), whose sum is σ = 394423779456. Its totient is φ = 108518711600.

The previous prime is 221211219961. The next prime is 221211220031. The reversal of 221211220012 is 210022112122.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521724364 + ... + 521724787.

It is an arithmetic number, because the mean of its divisors is an integer number (32868648288).

Almost surely, 2^221211220012 is an apocalyptic number.

It is an amenable number.

221211220012 is a deficient number, since it is larger than the sum of its proper divisors (173212559444).

221211220012 is a wasteful number, since it uses less digits than its factorization.

221211220012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043449208 (or 1043449206 counting only the distinct ones).

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

Adding to 221211220012 its reverse (210022112122), we get a palindrome (431233332134).

The spelling of 221211220012 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred twenty thousand, twelve".