5221236121 has 4 divisors (see below), whose sum is σ = 5230610532. Its totient is φ = 5211861712.

The previous prime is 5221236109. The next prime is 5221236133. The reversal of 5221236121 is 1216321225.

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

It is an interprime number because it is at equal distance from previous prime (5221236109) and next prime (5221236133).

It can be written as a sum of positive squares in 2 ways, for example, as 1278777600 + 3942458521 = 35760^2 + 62789^2 .

It is a cyclic number.

It is not a de Polignac number, because 5221236121 - 2²⁷ = 5087018393 is a prime.

It is a super-2 number, since 2×5221236121² = 54522613262470253282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5221236151) 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, 4686370 + ... + 4687483.

It is an arithmetic number, because the mean of its divisors is an integer number (1307652633).

Almost surely, 2^5221236121 is an apocalyptic number.

It is an amenable number.

5221236121 is a deficient number, since it is larger than the sum of its proper divisors (9374411).

5221236121 is an equidigital number, since it uses as much as digits as its factorization.

5221236121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9374410.

The product of its digits is 1440, while the sum is 25.

The square root of 5221236121 is about 72258.1214881760. The cubic root of 5221236121 is about 1734.8334124037.

Adding to 5221236121 its reverse (1216321225), we get a palindrome (6437557346).

The spelling of 5221236121 in words is "five billion, two hundred twenty-one million, two hundred thirty-six thousand, one hundred twenty-one".