31404434012221 has 4 divisors (see below), whose sum is σ = 31405054078944. Its totient is φ = 31403813945500.

The previous prime is 31404434012153. The next prime is 31404434012251. The reversal of 31404434012221 is 12221043440413.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31404434012221 - 2²⁵ = 31404400457789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31404434012251) 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, 309957385 + ... + 310058686.

It is an arithmetic number, because the mean of its divisors is an integer number (7851263519736).

Almost surely, 2^{31404434012221} is an apocalyptic number.

It is an amenable number.

31404434012221 is a deficient number, since it is larger than the sum of its proper divisors (620066723).

31404434012221 is an equidigital number, since it uses as much as digits as its factorization.

31404434012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620066722.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 31404434012221 its reverse (12221043440413), we get a palindrome (43625477452634).

The spelling of 31404434012221 in words is "thirty-one trillion, four hundred four billion, four hundred thirty-four million, twelve thousand, two hundred twenty-one".