53023443521 has 4 divisors (see below), whose sum is σ = 53062063572. Its totient is φ = 52984823472.

The previous prime is 53023443509. The next prime is 53023443523. The reversal of 53023443521 is 12534432035.

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 48625101121 + 4398342400 = 220511^2 + 66320^2 .

It is a cyclic number.

It is not a de Polignac number, because 53023443521 - 2³⁴ = 35843574337 is a prime.

It is a super-2 number, since 2×53023443521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53023443523) 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, 19307966 + ... + 19310711.

It is an arithmetic number, because the mean of its divisors is an integer number (13265515893).

Almost surely, 2^53023443521 is an apocalyptic number.

It is an amenable number.

53023443521 is a deficient number, since it is larger than the sum of its proper divisors (38620051).

53023443521 is a wasteful number, since it uses less digits than its factorization.

53023443521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38620050.

The product of its (nonzero) digits is 43200, while the sum is 32.

Adding to 53023443521 its reverse (12534432035), we get a palindrome (65557875556).

The spelling of 53023443521 in words is "fifty-three billion, twenty-three million, four hundred forty-three thousand, five hundred twenty-one".