213220320043231 has 4 divisors (see below), whose sum is σ = 213410186758552. Its totient is φ = 213030453327912.

The previous prime is 213220320043187. The next prime is 213220320043243. The reversal of 213220320043231 is 132340023022312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213220320043231 - 2³¹ = 213218172559583 is a prime.

It is a super-2 number, since 2×213220320043231² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213220320043231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213220320043631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94933355976 + ... + 94933358221.

It is an arithmetic number, because the mean of its divisors is an integer number (53352546689638).

Almost surely, 2^{213220320043231} is an apocalyptic number.

213220320043231 is a deficient number, since it is larger than the sum of its proper divisors (189866715321).

213220320043231 is a wasteful number, since it uses less digits than its factorization.

213220320043231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189866715320.

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 213220320043231 its reverse (132340023022312), we get a palindrome (345560343065543).

The spelling of 213220320043231 in words is "two hundred thirteen trillion, two hundred twenty billion, three hundred twenty million, forty-three thousand, two hundred thirty-one".