53213121 has 24 divisors (see below), whose sum is σ = 84802536. Its totient is φ = 31944960.

The previous prime is 53213089. The next prime is 53213123. The reversal of 53213121 is 12131235.

53213121 is a `hidden beast` number, since 532 + 13 + 121 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 505521 + 52707600 = 711^2 + 7260^2 .

It is not a de Polignac number, because 53213121 - 2⁵ = 53213089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 53213094 and 53213103.

It is not an unprimeable number, because it can be changed into a prime (53213123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 750 + ... + 10343.

It is an arithmetic number, because the mean of its divisors is an integer number (3533439).

Almost surely, 2^53213121 is an apocalyptic number.

It is an amenable number.

53213121 is a deficient number, since it is larger than the sum of its proper divisors (31589415).

53213121 is a wasteful number, since it uses less digits than its factorization.

53213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11153 (or 11150 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 53213121 is about 7294.7324145578. The cubic root of 53213121 is about 376.1313884609.

Adding to 53213121 its reverse (12131235), we get a palindrome (65344356).

The spelling of 53213121 in words is "fifty-three million, two hundred thirteen thousand, one hundred twenty-one".