53143522021 has 4 divisors (see below), whose sum is σ = 53173839532. Its totient is φ = 53113204512.

The previous prime is 53143521997. The next prime is 53143522031. The reversal of 53143522021 is 12022534135.

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 28802841796 + 24340680225 = 169714^2 + 156015^2 .

It is a cyclic number.

It is not a de Polignac number, because 53143522021 - 2³⁵ = 18783783653 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 (53143522031) 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, 15156126 + ... + 15159631.

It is an arithmetic number, because the mean of its divisors is an integer number (13293459883).

Almost surely, 2^53143522021 is an apocalyptic number.

It is an amenable number.

53143522021 is a deficient number, since it is larger than the sum of its proper divisors (30317511).

53143522021 is a wasteful number, since it uses less digits than its factorization.

53143522021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30317510.

The product of its (nonzero) digits is 7200, while the sum is 28.

The spelling of 53143522021 in words is "fifty-three billion, one hundred forty-three million, five hundred twenty-two thousand, twenty-one".