254158021 has 8 divisors (see below), whose sum is σ = 274178520. Its totient is φ = 234204672.

The previous prime is 254157991. The next prime is 254158043. The reversal of 254158021 is 120851452.

It can be written as a sum of positive squares in 4 ways, for example, as 9235521 + 244922500 = 3039^2 + 15650^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 254158021 - 2⁵ = 254157989 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 (254152021) 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 in 7 ways as a sum of consecutive naturals, for example, 8776 + ... + 24193.

It is an arithmetic number, because the mean of its divisors is an integer number (34272315).

Almost surely, 2^254158021 is an apocalyptic number.

It is an amenable number.

254158021 is a deficient number, since it is larger than the sum of its proper divisors (20020499).

254158021 is a wasteful number, since it uses less digits than its factorization.

254158021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33575.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 254158021 is about 15942.3342393766. The cubic root of 254158021 is about 633.4338580663.

The spelling of 254158021 in words is "two hundred fifty-four million, one hundred fifty-eight thousand, twenty-one".