213120221231 has 16 divisors (see below), whose sum is σ = 225244454400. Its totient is φ = 201087432000.

The previous prime is 213120221221. The next prime is 213120221233. The reversal of 213120221231 is 132122021312.

213120221231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213120221231 is a prime.

It is a super-2 number, since 2×213120221231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213120221233) 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 in 15 ways as a sum of consecutive naturals, for example, 12543500 + ... + 12560478.

It is an arithmetic number, because the mean of its divisors is an integer number (14077778400).

Almost surely, 2^213120221231 is an apocalyptic number.

213120221231 is a deficient number, since it is larger than the sum of its proper divisors (12124233169).

213120221231 is a wasteful number, since it uses less digits than its factorization.

213120221231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19630.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 213120221231 its reverse (132122021312), we get a palindrome (345242242543).

The spelling of 213120221231 in words is "two hundred thirteen billion, one hundred twenty million, two hundred twenty-one thousand, two hundred thirty-one".