52207021 has 4 divisors (see below), whose sum is σ = 52395772. Its totient is φ = 52018272.

The previous prime is 52207019. The next prime is 52207027. The reversal of 52207021 is 12070225.

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 32046921 + 20160100 = 5661^2 + 4490^2 .

It is a cyclic number.

It is not a de Polignac number, because 52207021 - 2¹ = 52207019 is a prime.

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 52207021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52207027) 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, 93960 + ... + 94513.

It is an arithmetic number, because the mean of its divisors is an integer number (13098943).

Almost surely, 2^52207021 is an apocalyptic number.

It is an amenable number.

52207021 is a deficient number, since it is larger than the sum of its proper divisors (188751).

52207021 is a wasteful number, since it uses less digits than its factorization.

52207021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188750.

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

The square root of 52207021 is about 7225.4426162001. The cubic root of 52207021 is about 373.7457855701.

Adding to 52207021 its reverse (12070225), we get a palindrome (64277246).

The spelling of 52207021 in words is "fifty-two million, two hundred seven thousand, twenty-one".