2131214321 has 4 divisors (see below), whose sum is σ = 2204704500. Its totient is φ = 2057724144.

The previous prime is 2131214311. The next prime is 2131214383. The reversal of 2131214321 is 1234121312.

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 720385600 + 1410828721 = 26840^2 + 37561^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131214321 - 2¹⁰ = 2131213297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2131214293 and 2131214302.

It is not an unprimeable number, because it can be changed into a prime (2131214311) 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, 36745046 + ... + 36745103.

It is an arithmetic number, because the mean of its divisors is an integer number (551176125).

Almost surely, 2^2131214321 is an apocalyptic number.

It is an amenable number.

2131214321 is a deficient number, since it is larger than the sum of its proper divisors (73490179).

2131214321 is an equidigital number, since it uses as much as digits as its factorization.

2131214321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73490178.

The product of its digits is 288, while the sum is 20.

The square root of 2131214321 is about 46165.0768546961. The cubic root of 2131214321 is about 1286.8928124594.

Adding to 2131214321 its reverse (1234121312), we get a palindrome (3365335633).

The spelling of 2131214321 in words is "two billion, one hundred thirty-one million, two hundred fourteen thousand, three hundred twenty-one".