213521340503 has 2 divisors, whose sum is σ = 213521340504. Its totient is φ = 213521340502.

The previous prime is 213521340451. The next prime is 213521340521. The reversal of 213521340503 is 305043125312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213521340503 is a prime.

It is a super-3 number, since 3×213521340503³ (a number of 35 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213521340523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106760670251 + 106760670252.

It is an arithmetic number, because the mean of its divisors is an integer number (106760670252).

Almost surely, 2^213521340503 is an apocalyptic number.

213521340503 is a deficient number, since it is larger than the sum of its proper divisors (1).

213521340503 is an equidigital number, since it uses as much as digits as its factorization.

213521340503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 213521340503 its reverse (305043125312), we get a palindrome (518564465815).

The spelling of 213521340503 in words is "two hundred thirteen billion, five hundred twenty-one million, three hundred forty thousand, five hundred three".