20121203 has 4 divisors (see below), whose sum is σ = 20254608. Its totient is φ = 19987800.

The previous prime is 20121193. The next prime is 20121271. The reversal of 20121203 is 30212102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30212102 = 2 ⋅15106051.

It is a cyclic number.

It is not a de Polignac number, because 20121203 - 2¹² = 20117107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66476 + ... + 66777.

It is an arithmetic number, because the mean of its divisors is an integer number (5063652).

Almost surely, 2^20121203 is an apocalyptic number.

20121203 is a deficient number, since it is larger than the sum of its proper divisors (133405).

20121203 is a wasteful number, since it uses less digits than its factorization.

20121203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133404.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 20121203 is about 4485.6663941938. Note that the first 3 decimals coincide. The cubic root of 20121203 is about 271.9889836585.

Adding to 20121203 its reverse (30212102), we get a palindrome (50333305).

The spelling of 20121203 in words is "twenty million, one hundred twenty-one thousand, two hundred three".