5311231221521 has 4 divisors (see below), whose sum is σ = 5313134209344. Its totient is φ = 5309328233700.

The previous prime is 5311231221511. The next prime is 5311231221523. The reversal of 5311231221521 is 1251221321135.

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 a de Polignac number, because none of the positive numbers 2^k-5311231221521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5311231221523) 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, 951489725 + ... + 951495306.

It is an arithmetic number, because the mean of its divisors is an integer number (1328283552336).

Almost surely, 2^{5311231221521} is an apocalyptic number.

It is an amenable number.

5311231221521 is a deficient number, since it is larger than the sum of its proper divisors (1902987823).

5311231221521 is a wasteful number, since it uses less digits than its factorization.

5311231221521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1902987822.

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

Adding to 5311231221521 its reverse (1251221321135), we get a palindrome (6562452542656).

The spelling of 5311231221521 in words is "five trillion, three hundred eleven billion, two hundred thirty-one million, two hundred twenty-one thousand, five hundred twenty-one".