213231220403 has 2 divisors, whose sum is σ = 213231220404. Its totient is φ = 213231220402.

The previous prime is 213231220381. The next prime is 213231220427. The reversal of 213231220403 is 304022132312.

213231220403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213231220403 - 2¹⁶ = 213231154867 is a prime.

It is not a weakly prime, because it can be changed into another prime (213231220493) 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, 106615610201 + 106615610202.

It is an arithmetic number, because the mean of its divisors is an integer number (106615610202).

Almost surely, 2^213231220403 is an apocalyptic number.

213231220403 is a deficient number, since it is larger than the sum of its proper divisors (1).

213231220403 is an equidigital number, since it uses as much as digits as its factorization.

213231220403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 213231220403 its reverse (304022132312), we get a palindrome (517253352715).

The spelling of 213231220403 in words is "two hundred thirteen billion, two hundred thirty-one million, two hundred twenty thousand, four hundred three".