221211210121012 has 12 divisors (see below), whose sum is σ = 387122672628580. Its totient is φ = 110604732227136.

The previous prime is 221211210121009. The next prime is 221211210121061. The reversal of 221211210121012 is 210121012112122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 38303275393296 + 182907934727716 = 6188964^2 + 13524346^2 .

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, 217637937 + ... + 218651992.

Almost surely, 2^{221211210121012} is an apocalyptic number.

It is an amenable number.

221211210121012 is a deficient number, since it is larger than the sum of its proper divisors (165911462507568).

221211210121012 is a wasteful number, since it uses less digits than its factorization.

221211210121012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436416690 (or 436416688 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221211210121012 its reverse (210121012112122), we get a palindrome (431332222233134).

The spelling of 221211210121012 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred ten million, one hundred twenty-one thousand, twelve".