242021081 has 2 divisors, whose sum is σ = 242021082. Its totient is φ = 242021080.

The previous prime is 242021051. The next prime is 242021119. The reversal of 242021081 is 180120242.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185395456 + 56625625 = 13616^2 + 7525^2 .

It is a cyclic number.

It is not a de Polignac number, because 242021081 - 2¹⁰ = 242020057 is a prime.

It is a super-2 number, since 2×242021081² = 117148407296817122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (242021041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121010540 + 121010541.

It is an arithmetic number, because the mean of its divisors is an integer number (121010541).

Almost surely, 2^242021081 is an apocalyptic number.

It is an amenable number.

242021081 is a deficient number, since it is larger than the sum of its proper divisors (1).

242021081 is an equidigital number, since it uses as much as digits as its factorization.

242021081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 242021081 is about 15557.0267403511. The cubic root of 242021081 is about 623.1860629583.

The spelling of 242021081 in words is "two hundred forty-two million, twenty-one thousand, eighty-one".