5123223521 has 4 divisors (see below), whose sum is σ = 5517317652. Its totient is φ = 4729129392.

The previous prime is 5123223509. The next prime is 5123223533. The reversal of 5123223521 is 1253223215.

It is a happy number.

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 (5123223509) and next prime (5123223533).

It can be written as a sum of positive squares in 2 ways, for example, as 565488400 + 4557735121 = 23780^2 + 67511^2 .

It is not a de Polignac number, because 5123223521 - 2¹⁰ = 5123222497 is a prime.

It is a super-2 number, since 2×5123223521² = 52494838492255274882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5123223121) 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, 197047046 + ... + 197047071.

It is an arithmetic number, because the mean of its divisors is an integer number (1379329413).

Almost surely, 2^5123223521 is an apocalyptic number.

It is an amenable number.

5123223521 is a deficient number, since it is larger than the sum of its proper divisors (394094131).

5123223521 is a wasteful number, since it uses less digits than its factorization.

5123223521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394094130.

The product of its digits is 3600, while the sum is 26.

The square root of 5123223521 is about 71576.6967734611. The cubic root of 5123223521 is about 1723.9093878846.

Adding to 5123223521 its reverse (1253223215), we get a palindrome (6376446736).

The spelling of 5123223521 in words is "five billion, one hundred twenty-three million, two hundred twenty-three thousand, five hundred twenty-one".