20233121 has 4 divisors (see below), whose sum is σ = 20614932. Its totient is φ = 19851312.

The previous prime is 20233099. The next prime is 20233127. The reversal of 20233121 is 12133202.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17305600 + 2927521 = 4160^2 + 1711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20233121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20233096 and 20233105.

It is not an unprimeable number, because it can be changed into a prime (20233127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190826 + ... + 190931.

It is an arithmetic number, because the mean of its divisors is an integer number (5153733).

Almost surely, 2^20233121 is an apocalyptic number.

It is an amenable number.

20233121 is a deficient number, since it is larger than the sum of its proper divisors (381811).

20233121 is an equidigital number, since it uses as much as digits as its factorization.

20233121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381810.

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

The square root of 20233121 is about 4498.1241645824. The cubic root of 20233121 is about 272.4923365687.

Adding to 20233121 its reverse (12133202), we get a palindrome (32366323).

The spelling of 20233121 in words is "twenty million, two hundred thirty-three thousand, one hundred twenty-one".