52120021 has 16 divisors (see below), whose sum is σ = 57231360. Its totient is φ = 47280240.

The previous prime is 52119997. The next prime is 52120027. The reversal of 52120021 is 12002125.

It is a cyclic number.

It is not a de Polignac number, because 52120021 - 2¹⁵ = 52087253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 52119983 and 52120010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52120027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62610 + ... + 63436.

It is an arithmetic number, because the mean of its divisors is an integer number (3576960).

Almost surely, 2^52120021 is an apocalyptic number.

It is an amenable number.

52120021 is a deficient number, since it is larger than the sum of its proper divisors (5111339).

52120021 is a wasteful number, since it uses less digits than its factorization.

52120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 52120021 is about 7219.4197135227. The cubic root of 52120021 is about 373.5380615168.

Adding to 52120021 its reverse (12002125), we get a palindrome (64122146).

The spelling of 52120021 in words is "fifty-two million, one hundred twenty thousand, twenty-one".