121531203 has 24 divisors (see below), whose sum is σ = 179878608. Its totient is φ = 79045632.

The previous prime is 121531177. The next prime is 121531211. The reversal of 121531203 is 302135121.

It is not a de Polignac number, because 121531203 - 2⁵ = 121531171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121531213) 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, 62776 + ... + 64682.

It is an arithmetic number, because the mean of its divisors is an integer number (7494942).

Almost surely, 2^121531203 is an apocalyptic number.

121531203 is a deficient number, since it is larger than the sum of its proper divisors (58347405).

121531203 is a wasteful number, since it uses less digits than its factorization.

121531203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2083 (or 2080 counting only the distinct ones).

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

The square root of 121531203 is about 11024.1191484853. The cubic root of 121531203 is about 495.3314828969.

Adding to 121531203 its reverse (302135121), we get a palindrome (423666324).

The spelling of 121531203 in words is "one hundred twenty-one million, five hundred thirty-one thousand, two hundred three".