2131404521 has 8 divisors (see below), whose sum is σ = 2186595840. Its totient is φ = 2076468912.

The previous prime is 2131404511. The next prime is 2131404523. The reversal of 2131404521 is 1254041312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2131404521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2131404523) 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, 46985 + ... + 80438.

It is an arithmetic number, because the mean of its divisors is an integer number (273324480).

Almost surely, 2^2131404521 is an apocalyptic number.

It is an amenable number.

2131404521 is a deficient number, since it is larger than the sum of its proper divisors (55191319).

2131404521 is a wasteful number, since it uses less digits than its factorization.

2131404521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127855.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 2131404521 is about 46167.1368074738. The cubic root of 2131404521 is about 1286.9310941922.

Adding to 2131404521 its reverse (1254041312), we get a palindrome (3385445833).

The spelling of 2131404521 in words is "two billion, one hundred thirty-one million, four hundred four thousand, five hundred twenty-one".