213612403 has 2 divisors, whose sum is σ = 213612404. Its totient is φ = 213612402.

The previous prime is 213612401. The next prime is 213612439. The reversal of 213612403 is 304216312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213612403 - 2¹ = 213612401 is a prime.

Together with 213612401, it forms a pair of twin primes.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (213612401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106806201 + 106806202.

It is an arithmetic number, because the mean of its divisors is an integer number (106806202).

Almost surely, 2^213612403 is an apocalyptic number.

213612403 is a deficient number, since it is larger than the sum of its proper divisors (1).

213612403 is an equidigital number, since it uses as much as digits as its factorization.

213612403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 213612403 is about 14615.4850415578. The cubic root of 213612403 is about 597.7810660399.

Adding to 213612403 its reverse (304216312), we get a palindrome (517828715).

The spelling of 213612403 in words is "two hundred thirteen million, six hundred twelve thousand, four hundred three".