52531221421 has 8 divisors (see below), whose sum is σ = 60157957824. Its totient is φ = 44935054080.

The previous prime is 52531221389. The next prime is 52531221437. The reversal of 52531221421 is 12412213525.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 52531221421 - 2⁵ = 52531221389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 52531221421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52531221481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7638580 + ... + 7645453.

It is an arithmetic number, because the mean of its divisors is an integer number (7519744728).

Almost surely, 2^52531221421 is an apocalyptic number.

It is an amenable number.

52531221421 is a deficient number, since it is larger than the sum of its proper divisors (7626736403).

52531221421 is a wasteful number, since it uses less digits than its factorization.

52531221421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15284531.

The product of its digits is 4800, while the sum is 28.

Adding to 52531221421 its reverse (12412213525), we get a palindrome (64943434946).

The spelling of 52531221421 in words is "fifty-two billion, five hundred thirty-one million, two hundred twenty-one thousand, four hundred twenty-one".