53121711 has 4 divisors (see below), whose sum is σ = 70828952. Its totient is φ = 35414472.

The previous prime is 53121709. The next prime is 53121721. The reversal of 53121711 is 11712135.

It is a happy number.

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

It is not a de Polignac number, because 53121711 - 2¹ = 53121709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53121721) 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, 8853616 + ... + 8853621.

It is an arithmetic number, because the mean of its divisors is an integer number (17707238).

Almost surely, 2^53121711 is an apocalyptic number.

53121711 is a deficient number, since it is larger than the sum of its proper divisors (17707241).

53121711 is a wasteful number, since it uses less digits than its factorization.

53121711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17707240.

The product of its digits is 210, while the sum is 21.

The square root of 53121711 is about 7288.4642415258. The cubic root of 53121711 is about 375.9158910064.

Adding to 53121711 its reverse (11712135), we get a palindrome (64833846).

The spelling of 53121711 in words is "fifty-three million, one hundred twenty-one thousand, seven hundred eleven".