2131302421 has 4 divisors (see below), whose sum is σ = 2200054144. Its totient is φ = 2062550700.

The previous prime is 2131302403. The next prime is 2131302451. The reversal of 2131302421 is 1242031312.

It is a happy number.

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 not a de Polignac number, because 2131302421 - 2¹¹ = 2131300373 is a prime.

It is a super-2 number, since 2×2131302421² = 9084900019520922482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131302451) 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, 34375815 + ... + 34375876.

It is an arithmetic number, because the mean of its divisors is an integer number (550013536).

Almost surely, 2^2131302421 is an apocalyptic number.

It is an amenable number.

2131302421 is a deficient number, since it is larger than the sum of its proper divisors (68751723).

2131302421 is an equidigital number, since it uses as much as digits as its factorization.

2131302421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68751722.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2131302421 is about 46166.0310293185. The cubic root of 2131302421 is about 1286.9105447124.

Adding to 2131302421 its reverse (1242031312), we get a palindrome (3373333733).

The spelling of 2131302421 in words is "two billion, one hundred thirty-one million, three hundred two thousand, four hundred twenty-one".