53512021 has 4 divisors (see below), whose sum is σ = 53537292. Its totient is φ = 53486752.

The previous prime is 53512003. The next prime is 53512031. The reversal of 53512021 is 12021535.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15689521 + 37822500 = 3961^2 + 6150^2 .

It is a cyclic number.

It is not a de Polignac number, because 53512021 - 2¹⁵ = 53479253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53512021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53512001) 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, 9136 + ... + 13801.

It is an arithmetic number, because the mean of its divisors is an integer number (13384323).

Almost surely, 2^53512021 is an apocalyptic number.

It is an amenable number.

53512021 is a deficient number, since it is larger than the sum of its proper divisors (25271).

53512021 is a wasteful number, since it uses less digits than its factorization.

53512021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25270.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 53512021 is about 7315.1911116525. The cubic root of 53512021 is about 376.8343217767.

Adding to 53512021 its reverse (12021535), we get a palindrome (65533556).

The spelling of 53512021 in words is "fifty-three million, five hundred twelve thousand, twenty-one".