213344213021 has 4 divisors (see below), whose sum is σ = 215741339100. Its totient is φ = 210947086944.

The previous prime is 213344213003. The next prime is 213344213039. The reversal of 213344213021 is 120312443312.

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

It is an interprime number because it is at equal distance from previous prime (213344213003) and next prime (213344213039).

It can be written as a sum of positive squares in 2 ways, for example, as 74207752921 + 139136460100 = 272411^2 + 373010^2 .

It is a cyclic number.

It is not a de Polignac number, because 213344213021 - 2⁶ = 213344212957 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 (213344213221) 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, 1198562906 + ... + 1198563083.

It is an arithmetic number, because the mean of its divisors is an integer number (53935334775).

Almost surely, 2^213344213021 is an apocalyptic number.

It is an amenable number.

213344213021 is a deficient number, since it is larger than the sum of its proper divisors (2397126079).

213344213021 is an equidigital number, since it uses as much as digits as its factorization.

213344213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2397126078.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 213344213021 its reverse (120312443312), we get a palindrome (333656656333).

The spelling of 213344213021 in words is "two hundred thirteen billion, three hundred forty-four million, two hundred thirteen thousand, twenty-one".