213111313421 has 6 divisors (see below), whose sum is σ = 226384682730. Its totient is φ = 200575353536.

The previous prime is 213111313411. The next prime is 213111313447. The reversal of 213111313421 is 124313111312.

It can be written as a sum of positive squares in 3 ways, for example, as 91597022500 + 121514290921 = 302650^2 + 348589^2 .

It is not a de Polignac number, because 213111313421 - 2³⁴ = 195931444237 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 (213111313411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 368704406 + ... + 368704983.

It is an arithmetic number, because the mean of its divisors is an integer number (37730780455).

Almost surely, 2^213111313421 is an apocalyptic number.

It is an amenable number.

213111313421 is a deficient number, since it is larger than the sum of its proper divisors (13273369309).

213111313421 is an equidigital number, since it uses as much as digits as its factorization.

213111313421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737409423 (or 737409406 counting only the distinct ones).

The product of its digits is 432, while the sum is 23.

Adding to 213111313421 its reverse (124313111312), we get a palindrome (337424424733).

The spelling of 213111313421 in words is "two hundred thirteen billion, one hundred eleven million, three hundred thirteen thousand, four hundred twenty-one".