242203021 has 2 divisors, whose sum is σ = 242203022. Its totient is φ = 242203020.

The previous prime is 242203009. The next prime is 242203033. The reversal of 242203021 is 120302242.

It is a balanced prime because it is at equal distance from previous prime (242203009) and next prime (242203033).

It can be written as a sum of positive squares in only one way, i.e., 241180900 + 1022121 = 15530^2 + 1011^2 .

It is a cyclic number.

It is not a de Polignac number, because 242203021 - 2²⁵ = 208648589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 242202986 and 242203004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242203121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121101510 + 121101511.

It is an arithmetic number, because the mean of its divisors is an integer number (121101511).

Almost surely, 2^242203021 is an apocalyptic number.

It is an amenable number.

242203021 is a deficient number, since it is larger than the sum of its proper divisors (1).

242203021 is an equidigital number, since it uses as much as digits as its factorization.

242203021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 242203021 is about 15562.8731601848. The cubic root of 242203021 is about 623.3421844441.

Adding to 242203021 its reverse (120302242), we get a palindrome (362505263).

The spelling of 242203021 in words is "two hundred forty-two million, two hundred three thousand, twenty-one".