11312131521 has 8 divisors (see below), whose sum is σ = 15083333440. Its totient is φ = 7541175312.

The previous prime is 11312131463. The next prime is 11312131547. The reversal of 11312131521 is 12513121311.

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

It is not a de Polignac number, because 11312131521 - 2¹⁴ = 11312115137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11312131321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148095 + ... + 211083.

It is an arithmetic number, because the mean of its divisors is an integer number (1885416680).

Almost surely, 2^11312131521 is an apocalyptic number.

It is an amenable number.

11312131521 is a deficient number, since it is larger than the sum of its proper divisors (3771201919).

11312131521 is an equidigital number, since it uses as much as digits as its factorization.

11312131521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122855.

The product of its digits is 180, while the sum is 21.

Adding to 11312131521 its reverse (12513121311), we get a palindrome (23825252832).

The spelling of 11312131521 in words is "eleven billion, three hundred twelve million, one hundred thirty-one thousand, five hundred twenty-one".