20243021 has 2 divisors, whose sum is σ = 20243022. Its totient is φ = 20243020.

The previous prime is 20243017. The next prime is 20243029. The reversal of 20243021 is 12034202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18826921 + 1416100 = 4339^2 + 1190^2 .

It is a cyclic number.

It is not a de Polignac number, because 20243021 - 2² = 20243017 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20242987 and 20243005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20243029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10121510 + 10121511.

It is an arithmetic number, because the mean of its divisors is an integer number (10121511).

Almost surely, 2^20243021 is an apocalyptic number.

It is an amenable number.

20243021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20243021 is an equidigital number, since it uses as much as digits as its factorization.

20243021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20243021 is about 4499.2244887314. The cubic root of 20243021 is about 272.5367725254.

Adding to 20243021 its reverse (12034202), we get a palindrome (32277223).

The spelling of 20243021 in words is "twenty million, two hundred forty-three thousand, twenty-one".