2121311431505 has 8 divisors (see below), whose sum is σ = 2909227106112. Its totient is φ = 1454613553008.

The previous prime is 2121311431433. The next prime is 2121311431517. The reversal of 2121311431505 is 5051341131212.

It is a happy number.

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

It is not a de Polignac number, because 2121311431505 - 2⁸ = 2121311431249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30304448987 + ... + 30304449056.

It is an arithmetic number, because the mean of its divisors is an integer number (363653388264).

Almost surely, 2^{2121311431505} is an apocalyptic number.

It is an amenable number.

2121311431505 is a deficient number, since it is larger than the sum of its proper divisors (787915674607).

2121311431505 is an equidigital number, since it uses as much as digits as its factorization.

2121311431505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60608898055.

The product of its (nonzero) digits is 3600, while the sum is 29.

Adding to 2121311431505 its reverse (5051341131212), we get a palindrome (7172652562717).

The spelling of 2121311431505 in words is "two trillion, one hundred twenty-one billion, three hundred eleven million, four hundred thirty-one thousand, five hundred five".