5206720121 has 4 divisors (see below), whose sum is σ = 5207118672. Its totient is φ = 5206321572.

The previous prime is 5206720073. The next prime is 5206720133. The reversal of 5206720121 is 1210276025.

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 5206720121 - 2¹⁰ = 5206719097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5206720171) 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, 178991 + ... + 206036.

It is an arithmetic number, because the mean of its divisors is an integer number (1301779668).

Almost surely, 2^5206720121 is an apocalyptic number.

It is an amenable number.

5206720121 is a deficient number, since it is larger than the sum of its proper divisors (398551).

5206720121 is a wasteful number, since it uses less digits than its factorization.

5206720121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398550.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 5206720121 is about 72157.6061202144. The cubic root of 5206720121 is about 1733.2242011625.

Adding to 5206720121 its reverse (1210276025), we get a palindrome (6416996146).

The spelling of 5206720121 in words is "five billion, two hundred six million, seven hundred twenty thousand, one hundred twenty-one".