240203021 has 2 divisors, whose sum is σ = 240203022. Its totient is φ = 240203020.

The previous prime is 240203003. The next prime is 240203023. The reversal of 240203021 is 120302042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159112996 + 81090025 = 12614^2 + 9005^2 .

It is a cyclic number.

It is not a de Polignac number, because 240203021 - 2⁶ = 240202957 is a prime.

Together with 240203023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 240202987 and 240203005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240203023) 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 as a sum of consecutive naturals, namely, 120101510 + 120101511.

It is an arithmetic number, because the mean of its divisors is an integer number (120101511).

Almost surely, 2^240203021 is an apocalyptic number.

It is an amenable number.

240203021 is a deficient number, since it is larger than the sum of its proper divisors (1).

240203021 is an equidigital number, since it uses as much as digits as its factorization.

240203021 is an odious number, because the sum of its binary digits is odd.

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

The square root of 240203021 is about 15498.4844742962. The cubic root of 240203021 is about 621.6216833174.

Adding to 240203021 its reverse (120302042), we get a palindrome (360505063).

The spelling of 240203021 in words is "two hundred forty million, two hundred three thousand, twenty-one".