253402442221 has 8 divisors (see below), whose sum is σ = 277560484920. Its totient is φ = 230272401408.

The previous prime is 253402442213. The next prime is 253402442239. The reversal of 253402442221 is 122244204352.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 151889472900 + 101512969321 = 389730^2 + 318611^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 253402442221 - 2³ = 253402442213 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 (253402442281) 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, 256999956 + ... + 257000941.

It is an arithmetic number, because the mean of its divisors is an integer number (34695060615).

Almost surely, 2^253402442221 is an apocalyptic number.

It is an amenable number.

253402442221 is a deficient number, since it is larger than the sum of its proper divisors (24158042699).

253402442221 is a wasteful number, since it uses less digits than its factorization.

253402442221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514000943.

The product of its (nonzero) digits is 30720, while the sum is 31.

Adding to 253402442221 its reverse (122244204352), we get a palindrome (375646646573).

The spelling of 253402442221 in words is "two hundred fifty-three billion, four hundred two million, four hundred forty-two thousand, two hundred twenty-one".