52420521 has 4 divisors (see below), whose sum is σ = 69894032. Its totient is φ = 34947012.

The previous prime is 52420493. The next prime is 52420541. The reversal of 52420521 is 12502425.

It is a happy number.

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 not a de Polignac number, because 52420521 - 2⁶ = 52420457 is a prime.

It is a super-2 number, since 2×52420521² = 5495822043822882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (52420541) 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, 8736751 + ... + 8736756.

It is an arithmetic number, because the mean of its divisors is an integer number (17473508).

Almost surely, 2^52420521 is an apocalyptic number.

It is an amenable number.

52420521 is a deficient number, since it is larger than the sum of its proper divisors (17473511).

52420521 is a wasteful number, since it uses less digits than its factorization.

52420521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17473510.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 52420521 is about 7240.2017237091. The cubic root of 52420521 is about 374.2545689799.

Adding to 52420521 its reverse (12502425), we get a palindrome (64922946).

The spelling of 52420521 in words is "fifty-two million, four hundred twenty thousand, five hundred twenty-one".