213253521431 has 16 divisors (see below), whose sum is σ = 225782793600. Its totient is φ = 200855440800.

The previous prime is 213253521427. The next prime is 213253521433. The reversal of 213253521431 is 134125352312.

It is a cyclic number.

It is not a de Polignac number, because 213253521431 - 2² = 213253521427 is a prime.

It is a super-2 number, since 2×213253521431² (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 (213253521433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16125740 + ... + 16138958.

It is an arithmetic number, because the mean of its divisors is an integer number (14111424600).

Almost surely, 2^213253521431 is an apocalyptic number.

213253521431 is a deficient number, since it is larger than the sum of its proper divisors (12529272169).

213253521431 is a wasteful number, since it uses less digits than its factorization.

213253521431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18110.

The product of its digits is 21600, while the sum is 32.

Adding to 213253521431 its reverse (134125352312), we get a palindrome (347378873743).

The spelling of 213253521431 in words is "two hundred thirteen billion, two hundred fifty-three million, five hundred twenty-one thousand, four hundred thirty-one".