31554513311421 has 4 divisors (see below), whose sum is σ = 42072684415232. Its totient is φ = 21036342207612.

The previous prime is 31554513311413. The next prime is 31554513311537. The reversal of 31554513311421 is 12411331545513.

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 not a de Polignac number, because 31554513311421 - 2³ = 31554513311413 is a prime.

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 31554513311421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31554513311821) 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, 5259085551901 + ... + 5259085551906.

It is an arithmetic number, because the mean of its divisors is an integer number (10518171103808).

Almost surely, 2^{31554513311421} is an apocalyptic number.

It is an amenable number.

31554513311421 is a deficient number, since it is larger than the sum of its proper divisors (10518171103811).

31554513311421 is a wasteful number, since it uses less digits than its factorization.

31554513311421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10518171103810.

The product of its digits is 108000, while the sum is 39.

Adding to 31554513311421 its reverse (12411331545513), we get a palindrome (43965844856934).

The spelling of 31554513311421 in words is "thirty-one trillion, five hundred fifty-four billion, five hundred thirteen million, three hundred eleven thousand, four hundred twenty-one".