221001011212 has 6 divisors (see below), whose sum is σ = 386751769628. Its totient is φ = 110500505604.

The previous prime is 221001011207. The next prime is 221001011213. The reversal of 221001011212 is 212110100122.

221001011212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-4 number, since 4×221001011212⁴ (a number of 46 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221001011192 and 221001011201.

It is not an unprimeable number, because it can be changed into a prime (221001011213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27625126398 + ... + 27625126405.

Almost surely, 2^221001011212 is an apocalyptic number.

It is an amenable number.

221001011212 is a deficient number, since it is larger than the sum of its proper divisors (165750758416).

221001011212 is a wasteful number, since it uses less digits than its factorization.

221001011212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55250252807 (or 55250252805 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221001011212 its reverse (212110100122), we get a palindrome (433111111334).

It can be divided in two parts, 2210010 and 11212, that added together give a palindrome (2221222).

The spelling of 221001011212 in words is "two hundred twenty-one billion, one million, eleven thousand, two hundred twelve".