53121224 has 32 divisors (see below), whose sum is σ = 108748920. Its totient is φ = 24178176.

The previous prime is 53121221. The next prime is 53121227. The reversal of 53121224 is 42212135.

53121224 = T₂₅₇ + T₂₅₈ + ... + T₆₉₄.

It is an interprime number because it is at equal distance from previous prime (53121221) and next prime (53121227).

It can be written as a sum of positive squares in 4 ways, for example, as 33849124 + 19272100 = 5818^2 + 4390^2 .

It is a junction number, because it is equal to n+sod(n) for n = 53121196 and 53121205.

It is not an unprimeable number, because it can be changed into a prime (53121221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4094 + ... + 11090.

Almost surely, 2^53121224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53121224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54374460).

53121224 is an abundant number, since it is smaller than the sum of its proper divisors (55627696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

53121224 is a wasteful number, since it uses less digits than its factorization.

53121224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7089 (or 7085 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 53121224 is about 7288.4308324906. The cubic root of 53121224 is about 375.9147422507.

Adding to 53121224 its reverse (42212135), we get a palindrome (95333359).

The spelling of 53121224 in words is "fifty-three million, one hundred twenty-one thousand, two hundred twenty-four".