53231222221 has 4 divisors (see below), whose sum is σ = 53498716000. Its totient is φ = 52963728444.

The previous prime is 53231222203. The next prime is 53231222227. The reversal of 53231222221 is 12222213235.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12222213235 = 5 ⋅2444442647.

It is a cyclic number.

It is not a de Polignac number, because 53231222221 - 2¹⁷ = 53231091149 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 (53231222227) 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, 133746591 + ... + 133746988.

It is an arithmetic number, because the mean of its divisors is an integer number (13374679000).

Almost surely, 2^53231222221 is an apocalyptic number.

It is an amenable number.

53231222221 is a deficient number, since it is larger than the sum of its proper divisors (267493779).

53231222221 is a wasteful number, since it uses less digits than its factorization.

53231222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267493778.

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

Adding to 53231222221 its reverse (12222213235), we get a palindrome (65453435456).

The spelling of 53231222221 in words is "fifty-three billion, two hundred thirty-one million, two hundred twenty-two thousand, two hundred twenty-one".