53500470021 has 12 divisors (see below), whose sum is σ = 77601800640. Its totient is φ = 35517744360.

The previous prime is 53500470019. The next prime is 53500470119. The reversal of 53500470021 is 12007400535.

It is a happy number.

It is not a de Polignac number, because 53500470021 - 2¹ = 53500470019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53500570021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12434035 + ... + 12438336.

It is an arithmetic number, because the mean of its divisors is an integer number (6466816720).

Almost surely, 2^53500470021 is an apocalyptic number.

It is an amenable number.

53500470021 is a deficient number, since it is larger than the sum of its proper divisors (24101330619).

53500470021 is a wasteful number, since it uses less digits than its factorization.

53500470021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24872616 (or 24872613 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

Adding to 53500470021 its reverse (12007400535), we get a palindrome (65507870556).

The spelling of 53500470021 in words is "fifty-three billion, five hundred million, four hundred seventy thousand, twenty-one".