221212120113 has 24 divisors (see below), whose sum is σ = 328675209408. Its totient is φ = 143265648672.

The previous prime is 221212120109. The next prime is 221212120117. The reversal of 221212120113 is 311021212122.

221212120113 is a `hidden beast` number, since 221 + 212 + 120 + 113 = 666.

It is an interprime number because it is at equal distance from previous prime (221212120109) and next prime (221212120117).

It is not a de Polignac number, because 221212120113 - 2² = 221212120109 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221212120117) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 302445 + ... + 730682.

It is an arithmetic number, because the mean of its divisors is an integer number (13694800392).

Almost surely, 2^221212120113 is an apocalyptic number.

It is an amenable number.

221212120113 is a deficient number, since it is larger than the sum of its proper divisors (107463089295).

221212120113 is a wasteful number, since it uses less digits than its factorization.

221212120113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033813 (or 1033810 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 221212120113 its reverse (311021212122), we get a palindrome (532233332235).

The spelling of 221212120113 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred twenty thousand, one hundred thirteen".