221212120213 has 16 divisors (see below), whose sum is σ = 253293002496. Its totient is φ = 189251314560.

The previous prime is 221212120189. The next prime is 221212120223. The reversal of 221212120213 is 312021212122.

It is a de Polignac number, because none of the positive numbers 2^k-221212120213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212120223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10354923 + ... + 10376263.

It is an arithmetic number, because the mean of its divisors is an integer number (15830812656).

Almost surely, 2^221212120213 is an apocalyptic number.

It is an amenable number.

221212120213 is a deficient number, since it is larger than the sum of its proper divisors (32080882283).

221212120213 is a wasteful number, since it uses less digits than its factorization.

221212120213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24084.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 221212120213 its reverse (312021212122), we get a palindrome (533233332335).

The spelling of 221212120213 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred twenty thousand, two hundred thirteen".