52072021 has 4 divisors (see below), whose sum is σ = 52124044. Its totient is φ = 52020000.

The previous prime is 52072019. The next prime is 52072109. The reversal of 52072021 is 12027025.

52072021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36469521 + 15602500 = 6039^2 + 3950^2 .

It is a 4-Lehmer number, since φ(52072021) divides (52072021-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 52072021 - 2¹ = 52072019 is a prime.

It is a super-2 number, since 2×52072021² = 5422990742048882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 52072021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52072001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24480 + ... + 26521.

It is an arithmetic number, because the mean of its divisors is an integer number (13031011).

It is a Poulet number, since it divides 2^52072020-1.

Almost surely, 2^52072021 is an apocalyptic number.

It is an amenable number.

52072021 is a deficient number, since it is larger than the sum of its proper divisors (52023).

52072021 is a wasteful number, since it uses less digits than its factorization.

52072021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52022.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 52072021 is about 7216.0945808657. The cubic root of 52072021 is about 373.4233561784.

Adding to 52072021 its reverse (12027025), we get a palindrome (64099046).

The spelling of 52072021 in words is "fifty-two million, seventy-two thousand, twenty-one".