221101212121012 has 12 divisors (see below), whose sum is σ = 386929786043556. Its totient is φ = 110549844680000.

The previous prime is 221101212121007. The next prime is 221101212121057. The reversal of 221101212121012 is 210121212101122.

It is a happy number.

221101212121012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 56411575863696 + 164689636257316 = 7510764^2 + 12833146^2 .

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, 189691489 + ... + 190853512.

It is an arithmetic number, because the mean of its divisors is an integer number (32244148836963).

Almost surely, 2^{221101212121012} is an apocalyptic number.

It is an amenable number.

221101212121012 is a deficient number, since it is larger than the sum of its proper divisors (165828573922544).

221101212121012 is a wasteful number, since it uses less digits than its factorization.

221101212121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380690258 (or 380690256 counting only the distinct ones).

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

Adding to 221101212121012 its reverse (210121212101122), we get a palindrome (431222424222134).

The spelling of 221101212121012 in words is "two hundred twenty-one trillion, one hundred one billion, two hundred twelve million, one hundred twenty-one thousand, twelve".