254520021 has 8 divisors (see below), whose sum is σ = 387840064. Its totient is φ = 145440000.

The previous prime is 254520011. The next prime is 254520023. The reversal of 254520021 is 120025452.

It is a happy number.

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

It is not a de Polignac number, because 254520021 - 2¹⁵ = 254487253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 12120001 = 254520021 / (2 + 5 + 4 + 5 + 2 + 0 + 0 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 254520021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (254520023) 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 in 7 ways as a sum of consecutive naturals, for example, 6059980 + ... + 6060021.

It is an arithmetic number, because the mean of its divisors is an integer number (48480008).

Almost surely, 2^254520021 is an apocalyptic number.

254520021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

254520021 is a deficient number, since it is larger than the sum of its proper divisors (133320043).

254520021 is a wasteful number, since it uses less digits than its factorization.

254520021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12120011.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 254520021 is about 15953.6836185252. The cubic root of 254520021 is about 633.7344509488.

Adding to 254520021 its reverse (120025452), we get a palindrome (374545473).

The spelling of 254520021 in words is "two hundred fifty-four million, five hundred twenty thousand, twenty-one".