121213503 has 24 divisors (see below), whose sum is σ = 187439616. Its totient is φ = 78197400.

The previous prime is 121213481. The next prime is 121213513. The reversal of 121213503 is 305312121.

It is not a de Polignac number, because 121213503 - 2⁵ = 121213471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121213513) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 513 + ... + 15578.

It is an arithmetic number, because the mean of its divisors is an integer number (7809984).

Almost surely, 2^121213503 is an apocalyptic number.

121213503 is a deficient number, since it is larger than the sum of its proper divisors (66226113).

121213503 is an equidigital number, since it uses as much as digits as its factorization.

121213503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16137 (or 16125 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 121213503 is about 11009.7004046432. The cubic root of 121213503 is about 494.8994837225.

Adding to 121213503 its reverse (305312121), we get a palindrome (426525624).

The spelling of 121213503 in words is "one hundred twenty-one million, two hundred thirteen thousand, five hundred three".