523121421 has 16 divisors (see below), whose sum is σ = 724025088. Its totient is φ = 335726400.

The previous prime is 523121387. The next prime is 523121491. The reversal of 523121421 is 124121325.

It is not a de Polignac number, because 523121421 - 2¹³ = 523113229 is a prime.

It is a super-3 number, since 3×523121421³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523121491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21810 + ... + 39011.

It is an arithmetic number, because the mean of its divisors is an integer number (45251568).

Almost surely, 2^523121421 is an apocalyptic number.

It is an amenable number.

523121421 is a deficient number, since it is larger than the sum of its proper divisors (200903667).

523121421 is a wasteful number, since it uses less digits than its factorization.

523121421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60932.

The product of its digits is 480, while the sum is 21.

The square root of 523121421 is about 22871.8477828093. The cubic root of 523121421 is about 805.7509656976.

Adding to 523121421 its reverse (124121325), we get a palindrome (647242746).

The spelling of 523121421 in words is "five hundred twenty-three million, one hundred twenty-one thousand, four hundred twenty-one".