53012736421 has 4 divisors (see below), whose sum is σ = 53013236812. Its totient is φ = 53012236032.

The previous prime is 53012736379. The next prime is 53012736451. The reversal of 53012736421 is 12463721035.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 39980002500 + 13032733921 = 199950^2 + 114161^2 .

It is a 4-Lehmer number, since φ(53012736421) divides (53012736421-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 53012736421 - 2²⁹ = 52475865509 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 (53012736451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21756 + ... + 326341.

It is an arithmetic number, because the mean of its divisors is an integer number (13253309203).

Almost surely, 2^53012736421 is an apocalyptic number.

It is an amenable number.

53012736421 is a deficient number, since it is larger than the sum of its proper divisors (500391).

53012736421 is a wasteful number, since it uses less digits than its factorization.

53012736421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500390.

The product of its (nonzero) digits is 30240, while the sum is 34.

The spelling of 53012736421 in words is "fifty-three billion, twelve million, seven hundred thirty-six thousand, four hundred twenty-one".