254647021 has 4 divisors (see below), whose sum is σ = 254702044. Its totient is φ = 254592000.

The previous prime is 254646979. The next prime is 254647031. The reversal of 254647021 is 120746452.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85932900 + 168714121 = 9270^2 + 12989^2 .

It is a cyclic number.

It is not a de Polignac number, because 254647021 - 2¹⁷ = 254515949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (254647031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19860 + ... + 30061.

It is an arithmetic number, because the mean of its divisors is an integer number (63675511).

Almost surely, 2^254647021 is an apocalyptic number.

It is an amenable number.

254647021 is a deficient number, since it is larger than the sum of its proper divisors (55023).

254647021 is an equidigital number, since it uses as much as digits as its factorization.

254647021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55022.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 254647021 is about 15957.6633941188. The cubic root of 254647021 is about 633.8398400285.

The spelling of 254647021 in words is "two hundred fifty-four million, six hundred forty-seven thousand, twenty-one".