523532021 has 4 divisors (see below), whose sum is σ = 523927872. Its totient is φ = 523136172.

The previous prime is 523531997. The next prime is 523532027. The reversal of 523532021 is 120235325.

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 not a de Polignac number, because 523532021 - 2¹⁴ = 523515637 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 (523532027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195935 + ... + 198588.

It is an arithmetic number, because the mean of its divisors is an integer number (130981968).

Almost surely, 2^523532021 is an apocalyptic number.

It is an amenable number.

523532021 is a deficient number, since it is larger than the sum of its proper divisors (395851).

523532021 is a wasteful number, since it uses less digits than its factorization.

523532021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395850.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 523532021 is about 22880.8221224675. The cubic root of 523532021 is about 805.9617229019.

Adding to 523532021 its reverse (120235325), we get a palindrome (643767346).

The spelling of 523532021 in words is "five hundred twenty-three million, five hundred thirty-two thousand, twenty-one".