52121231 has 4 divisors (see below), whose sum is σ = 52204464. Its totient is φ = 52038000.

The previous prime is 52121221. The next prime is 52121257. The reversal of 52121231 is 13212125.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52121231 is a prime.

It is a super-2 number, since 2×52121231² = 5433245441910722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52121221) 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, 40670 + ... + 41931.

It is an arithmetic number, because the mean of its divisors is an integer number (13051116).

Almost surely, 2^52121231 is an apocalyptic number.

52121231 is a deficient number, since it is larger than the sum of its proper divisors (83233).

52121231 is an equidigital number, since it uses as much as digits as its factorization.

52121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83232.

The product of its digits is 120, while the sum is 17.

The square root of 52121231 is about 7219.5035147855. The cubic root of 52121231 is about 373.5409521370.

Adding to 52121231 its reverse (13212125), we get a palindrome (65333356).

The spelling of 52121231 in words is "fifty-two million, one hundred twenty-one thousand, two hundred thirty-one".