254216665221 has 8 divisors (see below), whose sum is σ = 338971925760. Its totient is φ = 169469590752.

The previous prime is 254216665169. The next prime is 254216665223. The reversal of 254216665221 is 122566612452.

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 254216665221 - 2¹⁷ = 254216534149 is a prime.

It is a super-2 number, since 2×254216665221² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (254216665223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1973685 + ... + 2098538.

It is an arithmetic number, because the mean of its divisors is an integer number (42371490720).

Almost surely, 2^254216665221 is an apocalyptic number.

It is an amenable number.

254216665221 is a deficient number, since it is larger than the sum of its proper divisors (84755260539).

254216665221 is a wasteful number, since it uses less digits than its factorization.

254216665221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4093035.

The product of its digits is 345600, while the sum is 42.

The spelling of 254216665221 in words is "two hundred fifty-four billion, two hundred sixteen million, six hundred sixty-five thousand, two hundred twenty-one".