52870021 has 2 divisors, whose sum is σ = 52870022. Its totient is φ = 52870020.

The previous prime is 52870019. The next prime is 52870043. The reversal of 52870021 is 12007825.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41139396 + 11730625 = 6414^2 + 3425^2 .

It is a cyclic number.

It is not a de Polignac number, because 52870021 - 2¹ = 52870019 is a prime.

Together with 52870019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52870001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26435010 + 26435011.

It is an arithmetic number, because the mean of its divisors is an integer number (26435011).

Almost surely, 2^52870021 is an apocalyptic number.

It is an amenable number.

52870021 is a deficient number, since it is larger than the sum of its proper divisors (1).

52870021 is an equidigital number, since it uses as much as digits as its factorization.

52870021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 52870021 is about 7271.1774149721. The cubic root of 52870021 is about 375.3212559663.

Adding to 52870021 its reverse (12007825), we get a palindrome (64877846).

The spelling of 52870021 in words is "fifty-two million, eight hundred seventy thousand, twenty-one".