252424221 has 16 divisors (see below), whose sum is σ = 384887424. Its totient is φ = 144152064.

The previous prime is 252424219. The next prime is 252424231. The reversal of 252424221 is 122424252.

252424221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 252424221 - 2¹ = 252424219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 252424191 and 252424200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252424231) 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, 45621 + ... + 50853.

It is an arithmetic number, because the mean of its divisors is an integer number (24055464).

Almost surely, 2^252424221 is an apocalyptic number.

252424221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

252424221 is a deficient number, since it is larger than the sum of its proper divisors (132463203).

252424221 is a wasteful number, since it uses less digits than its factorization.

252424221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7540.

The product of its digits is 2560, while the sum is 24.

The square root of 252424221 is about 15887.8639533450. The cubic root of 252424221 is about 631.9901965645.

Adding to 252424221 its reverse (122424252), we get a palindrome (374848473).

The spelling of 252424221 in words is "two hundred fifty-two million, four hundred twenty-four thousand, two hundred twenty-one".