213402401 has 4 divisors (see below), whose sum is σ = 213453204. Its totient is φ = 213351600.

The previous prime is 213402373. The next prime is 213402457. The reversal of 213402401 is 104204312.

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 126540001 + 86862400 = 11249^2 + 9320^2 .

It is a cyclic number.

It is not a de Polignac number, because 213402401 - 2⁶ = 213402337 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 213402401.

It is not an unprimeable number, because it can be changed into a prime (213402001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18470 + ... + 27711.

It is an arithmetic number, because the mean of its divisors is an integer number (53363301).

Almost surely, 2^213402401 is an apocalyptic number.

It is an amenable number.

213402401 is a deficient number, since it is larger than the sum of its proper divisors (50803).

213402401 is an equidigital number, since it uses as much as digits as its factorization.

213402401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50802.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 213402401 is about 14608.2990454057. The cubic root of 213402401 is about 597.5851092852.

Adding to 213402401 its reverse (104204312), we get a palindrome (317606713).

The spelling of 213402401 in words is "two hundred thirteen million, four hundred two thousand, four hundred one".