20121233 has 4 divisors (see below), whose sum is σ = 21950448. Its totient is φ = 18292020.

The previous prime is 20121193. The next prime is 20121271. The reversal of 20121233 is 33212102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20121233 - 2⁶ = 20121169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121433) 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, 914591 + ... + 914612.

It is an arithmetic number, because the mean of its divisors is an integer number (5487612).

Almost surely, 2^20121233 is an apocalyptic number.

It is an amenable number.

20121233 is a deficient number, since it is larger than the sum of its proper divisors (1829215).

20121233 is a wasteful number, since it uses less digits than its factorization.

20121233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829214.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 20121233 is about 4485.6697381773. The cubic root of 20121233 is about 271.9891188337.

Adding to 20121233 its reverse (33212102), we get a palindrome (53333335).

The spelling of 20121233 in words is "twenty million, one hundred twenty-one thousand, two hundred thirty-three".