213240403 has 2 divisors, whose sum is σ = 213240404. Its totient is φ = 213240402.

The previous prime is 213240371. The next prime is 213240409. The reversal of 213240403 is 304042312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213240403 - 2⁵ = 213240371 is a prime.

It is not a weakly prime, because it can be changed into another prime (213240409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106620201 + 106620202.

It is an arithmetic number, because the mean of its divisors is an integer number (106620202).

Almost surely, 2^213240403 is an apocalyptic number.

213240403 is a deficient number, since it is larger than the sum of its proper divisors (1).

213240403 is an equidigital number, since it uses as much as digits as its factorization.

213240403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 213240403 is about 14602.7532677917. The cubic root of 213240403 is about 597.4338580987.

Adding to 213240403 its reverse (304042312), we get a palindrome (517282715).

The spelling of 213240403 in words is "two hundred thirteen million, two hundred forty thousand, four hundred three".