252143021 has 8 divisors (see below), whose sum is σ = 271662720. Its totient is φ = 232641072.

The previous prime is 252143011. The next prime is 252143029. The reversal of 252143021 is 120341252.

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 252143021 - 2¹⁰ = 252141997 is a prime.

It is a super-2 number, since 2×252143021² = 127152206078012882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 252142984 and 252143002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252143029) 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, 48800 + ... + 53718.

It is an arithmetic number, because the mean of its divisors is an integer number (33957840).

Almost surely, 2^252143021 is an apocalyptic number.

It is an amenable number.

252143021 is a deficient number, since it is larger than the sum of its proper divisors (19519699).

252143021 is a wasteful number, since it uses less digits than its factorization.

252143021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8875.

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

The square root of 252143021 is about 15879.0119654845. The cubic root of 252143021 is about 631.7554308263.

Adding to 252143021 its reverse (120341252), we get a palindrome (372484273).

The spelling of 252143021 in words is "two hundred fifty-two million, one hundred forty-three thousand, twenty-one".