242911021 has 2 divisors, whose sum is σ = 242911022. Its totient is φ = 242911020.

The previous prime is 242910961. The next prime is 242911051. The reversal of 242911021 is 120119242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 228432996 + 14478025 = 15114^2 + 3805^2 .

It is a cyclic number.

It is not a de Polignac number, because 242911021 - 2⁷ = 242910893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 242910983 and 242911001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242911051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121455510 + 121455511.

It is an arithmetic number, because the mean of its divisors is an integer number (121455511).

Almost surely, 2^242911021 is an apocalyptic number.

It is an amenable number.

242911021 is a deficient number, since it is larger than the sum of its proper divisors (1).

242911021 is an equidigital number, since it uses as much as digits as its factorization.

242911021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 242911021 is about 15585.6030040547. The cubic root of 242911021 is about 623.9489714531.

The spelling of 242911021 in words is "two hundred forty-two million, nine hundred eleven thousand, twenty-one".