253143021 has 16 divisors (see below), whose sum is σ = 346379264. Its totient is φ = 164357424.

The previous prime is 253142977. The next prime is 253143029. The reversal of 253143021 is 120341352.

It is not a de Polignac number, because 253143021 - 2¹³ = 253134829 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 (253143029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44670 + ... + 50016.

It is an arithmetic number, because the mean of its divisors is an integer number (21648704).

Almost surely, 2^253143021 is an apocalyptic number.

It is an amenable number.

253143021 is a deficient number, since it is larger than the sum of its proper divisors (93236243).

253143021 is a wasteful number, since it uses less digits than its factorization.

253143021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5760.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 253143021 is about 15910.4689120088. The cubic root of 253143021 is about 632.5895104720.

Adding to 253143021 its reverse (120341352), we get a palindrome (373484373).

The spelling of 253143021 in words is "two hundred fifty-three million, one hundred forty-three thousand, twenty-one".