523135421221 has 8 divisors (see below), whose sum is σ = 598197026304. Its totient is φ = 448155809520.

The previous prime is 523135421213. The next prime is 523135421233. The reversal of 523135421221 is 122124531325.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 523135421221 - 2³ = 523135421213 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 (523135521221) 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, 20484670 + ... + 20510191.

It is an arithmetic number, because the mean of its divisors is an integer number (74774628288).

Almost surely, 2^523135421221 is an apocalyptic number.

It is an amenable number.

523135421221 is a deficient number, since it is larger than the sum of its proper divisors (75061605083).

523135421221 is a wasteful number, since it uses less digits than its factorization.

523135421221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40996691.

The product of its digits is 14400, while the sum is 31.

Adding to 523135421221 its reverse (122124531325), we get a palindrome (645259952546).

The spelling of 523135421221 in words is "five hundred twenty-three billion, one hundred thirty-five million, four hundred twenty-one thousand, two hundred twenty-one".