254122021 has 2 divisors, whose sum is σ = 254122022. Its totient is φ = 254122020.

The previous prime is 254122019. The next prime is 254122051. The reversal of 254122021 is 120221452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 239909121 + 14212900 = 15489^2 + 3770^2 .

It is a cyclic number.

It is not a de Polignac number, because 254122021 - 2¹ = 254122019 is a prime.

Together with 254122019, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 254122021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (254122051) 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, 127061010 + 127061011.

It is an arithmetic number, because the mean of its divisors is an integer number (127061011).

Almost surely, 2^254122021 is an apocalyptic number.

It is an amenable number.

254122021 is a deficient number, since it is larger than the sum of its proper divisors (1).

254122021 is an equidigital number, since it uses as much as digits as its factorization.

254122021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 254122021 is about 15941.2051301023. The cubic root of 254122021 is about 633.4039492514.

Adding to 254122021 its reverse (120221452), we get a palindrome (374343473).

The spelling of 254122021 in words is "two hundred fifty-four million, one hundred twenty-two thousand, twenty-one".