213121131203 has 4 divisors (see below), whose sum is σ = 213197494128. Its totient is φ = 213044768280.

The previous prime is 213121131199. The next prime is 213121131239. The reversal of 213121131203 is 302131121312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213121131203 - 2² = 213121131199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213121131803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38177276 + ... + 38182857.

It is an arithmetic number, because the mean of its divisors is an integer number (53299373532).

Almost surely, 2^213121131203 is an apocalyptic number.

213121131203 is a deficient number, since it is larger than the sum of its proper divisors (76362925).

213121131203 is an equidigital number, since it uses as much as digits as its factorization.

213121131203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76362924.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 213121131203 its reverse (302131121312), we get a palindrome (515252252515).

The spelling of 213121131203 in words is "two hundred thirteen billion, one hundred twenty-one million, one hundred thirty-one thousand, two hundred three".