253142021 has 4 divisors (see below), whose sum is σ = 276154944. Its totient is φ = 230129100.

The previous prime is 253142011. The next prime is 253142033. The reversal of 253142021 is 120241352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 253142021 - 2¹⁸ = 252879877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 253141984 and 253142002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253142011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11506445 + ... + 11506466.

It is an arithmetic number, because the mean of its divisors is an integer number (69038736).

Almost surely, 2^253142021 is an apocalyptic number.

It is an amenable number.

253142021 is a deficient number, since it is larger than the sum of its proper divisors (23012923).

253142021 is a wasteful number, since it uses less digits than its factorization.

253142021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23012922.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 253142021 is about 15910.4374861284. The cubic root of 253142021 is about 632.5886774905.

Adding to 253142021 its reverse (120241352), we get a palindrome (373383373).

The spelling of 253142021 in words is "two hundred fifty-three million, one hundred forty-two thousand, twenty-one".