121431320531 has 8 divisors (see below), whose sum is σ = 123514903680. Its totient is φ = 119359092672.

The previous prime is 121431320503. The next prime is 121431320533. The reversal of 121431320531 is 135023134121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121431320531 - 2²⁶ = 121364211667 is a prime.

It is a super-2 number, since 2×121431320531² (a number of 23 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 121431320531.

It is not an unprimeable number, because it can be changed into a prime (121431320533) 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 7 ways as a sum of consecutive naturals, for example, 2817251 + ... + 2860028.

It is an arithmetic number, because the mean of its divisors is an integer number (15439362960).

Almost surely, 2^121431320531 is an apocalyptic number.

121431320531 is a deficient number, since it is larger than the sum of its proper divisors (2083583149).

121431320531 is an equidigital number, since it uses as much as digits as its factorization.

121431320531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5677645.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 121431320531 its reverse (135023134121), we get a palindrome (256454454652).

The spelling of 121431320531 in words is "one hundred twenty-one billion, four hundred thirty-one million, three hundred twenty thousand, five hundred thirty-one".