2131335421 has 4 divisors (see below), whose sum is σ = 2155283100. Its totient is φ = 2107387744.

The previous prime is 2131335397. The next prime is 2131335443. The reversal of 2131335421 is 1245331312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 353026521 + 1778308900 = 18789^2 + 42170^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131335421 - 2¹³ = 2131327229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131335491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11973706 + ... + 11973883.

It is an arithmetic number, because the mean of its divisors is an integer number (538820775).

Almost surely, 2^2131335421 is an apocalyptic number.

It is an amenable number.

2131335421 is a deficient number, since it is larger than the sum of its proper divisors (23947679).

2131335421 is an equidigital number, since it uses as much as digits as its factorization.

2131335421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23947678.

The product of its digits is 2160, while the sum is 25.

The square root of 2131335421 is about 46166.3884335780. The cubic root of 2131335421 is about 1286.9171866337.

Adding to 2131335421 its reverse (1245331312), we get a palindrome (3376666733).

The spelling of 2131335421 in words is "two billion, one hundred thirty-one million, three hundred thirty-five thousand, four hundred twenty-one".