53520220421 has 4 divisors (see below), whose sum is σ = 53523190092. Its totient is φ = 53517250752.

The previous prime is 53520220409. The next prime is 53520220463. The reversal of 53520220421 is 12402202535.

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 33889128100 + 19631092321 = 184090^2 + 140111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53520220421 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 (53520220121) 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, 1457636 + ... + 1493901.

It is an arithmetic number, because the mean of its divisors is an integer number (13380797523).

Almost surely, 2^53520220421 is an apocalyptic number.

It is an amenable number.

53520220421 is a deficient number, since it is larger than the sum of its proper divisors (2969671).

53520220421 is a wasteful number, since it uses less digits than its factorization.

53520220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2969670.

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 53520220421 its reverse (12402202535), we get a palindrome (65922422956).

The spelling of 53520220421 in words is "fifty-three billion, five hundred twenty million, two hundred twenty thousand, four hundred twenty-one".