53213220421 has 4 divisors (see below), whose sum is σ = 53321598144. Its totient is φ = 53104842700.

The previous prime is 53213220373. The next prime is 53213220427. The reversal of 53213220421 is 12402231235.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53213220421 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 (53213220427) 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, 54188125 + ... + 54189106.

It is an arithmetic number, because the mean of its divisors is an integer number (13330399536).

Almost surely, 2^53213220421 is an apocalyptic number.

It is an amenable number.

53213220421 is a deficient number, since it is larger than the sum of its proper divisors (108377723).

53213220421 is a wasteful number, since it uses less digits than its factorization.

53213220421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108377722.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 53213220421 its reverse (12402231235), we get a palindrome (65615451656).

The spelling of 53213220421 in words is "fifty-three billion, two hundred thirteen million, two hundred twenty thousand, four hundred twenty-one".