254402145204021 has 24 divisors (see below), whose sum is σ = 381101560126560. Its totient is φ = 169591726369872.

The previous prime is 254402145204017. The next prime is 254402145204029. The reversal of 254402145204021 is 120402541204452.

254402145204021 is a `hidden beast` number, since 2 + 5 + 4 + 402 + 1 + 45 + 204 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 254402145204021 - 2² = 254402145204017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (254402145204029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25692786 + ... + 34189523.

It is an arithmetic number, because the mean of its divisors is an integer number (15879231671940).

Almost surely, 2^{254402145204021} is an apocalyptic number.

It is an amenable number.

254402145204021 is a deficient number, since it is larger than the sum of its proper divisors (126699414922539).

254402145204021 is an equidigital number, since it uses as much as digits as its factorization.

254402145204021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59899807 (or 59899795 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 36.

Adding to 254402145204021 its reverse (120402541204452), we get a palindrome (374804686408473).

The spelling of 254402145204021 in words is "two hundred fifty-four trillion, four hundred two billion, one hundred forty-five million, two hundred four thousand, twenty-one".