531221213422131 has 4 divisors (see below), whose sum is σ = 708294951229512. Its totient is φ = 354147475614752.

The previous prime is 531221213422073. The next prime is 531221213422139. The reversal of 531221213422131 is 131224312122135.

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 531221213422131 - 2¹⁴ = 531221213405747 is a prime.

It is a super-2 number, since 2×531221213422131² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 531221213422092 and 531221213422101.

It is not an unprimeable number, because it can be changed into a prime (531221213422139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88536868903686 + ... + 88536868903691.

It is an arithmetic number, because the mean of its divisors is an integer number (177073737807378).

Almost surely, 2^{531221213422131} is an apocalyptic number.

531221213422131 is a deficient number, since it is larger than the sum of its proper divisors (177073737807381).

531221213422131 is a wasteful number, since it uses less digits than its factorization.

531221213422131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177073737807380.

The product of its digits is 17280, while the sum is 33.

Adding to 531221213422131 its reverse (131224312122135), we get a palindrome (662445525544266).

The spelling of 531221213422131 in words is "five hundred thirty-one trillion, two hundred twenty-one billion, two hundred thirteen million, four hundred twenty-two thousand, one hundred thirty-one".