52100021 has 4 divisors (see below), whose sum is σ = 52292544. Its totient is φ = 51907500.

The previous prime is 52100003. The next prime is 52100023. The reversal of 52100021 is 12000125.

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 a cyclic number.

It is not a de Polignac number, because 52100021 - 2¹⁴ = 52083637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 52099975 and 52100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52100023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95855 + ... + 96396.

It is an arithmetic number, because the mean of its divisors is an integer number (13073136).

Almost surely, 2^52100021 is an apocalyptic number.

It is an amenable number.

52100021 is a deficient number, since it is larger than the sum of its proper divisors (192523).

52100021 is a wasteful number, since it uses less digits than its factorization.

52100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192522.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 52100021 is about 7218.0344277372. The cubic root of 52100021 is about 373.4902761880.

Adding to 52100021 its reverse (12000125), we get a palindrome (64100146).

The spelling of 52100021 in words is "fifty-two million, one hundred thousand, twenty-one".