20243121 has 4 divisors (see below), whose sum is σ = 26990832. Its totient is φ = 13495412.

The previous prime is 20243117. The next prime is 20243137. The reversal of 20243121 is 12134202.

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 20243121 - 2² = 20243117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20243121.

It is not an unprimeable number, because it can be changed into a prime (20243101) 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, 3373851 + ... + 3373856.

It is an arithmetic number, because the mean of its divisors is an integer number (6747708).

Almost surely, 2^20243121 is an apocalyptic number.

It is an amenable number.

20243121 is a deficient number, since it is larger than the sum of its proper divisors (6747711).

20243121 is an equidigital number, since it uses as much as digits as its factorization.

20243121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6747710.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 20243121 is about 4499.2356017439. The cubic root of 20243121 is about 272.5372212995.

Adding to 20243121 its reverse (12134202), we get a palindrome (32377323).

The spelling of 20243121 in words is "twenty million, two hundred forty-three thousand, one hundred twenty-one".