1021532521 has 4 divisors (see below), whose sum is σ = 1021971600. Its totient is φ = 1021093444.

The previous prime is 1021532513. The next prime is 1021532539. The reversal of 1021532521 is 1252351201.

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: 1252351201 = 16871 ⋅74231.

It is a cyclic number.

It is not a de Polignac number, because 1021532521 - 2³ = 1021532513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021532492 and 1021532501.

It is not an unprimeable number, because it can be changed into a prime (1021532591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216031 + ... + 220708.

It is an arithmetic number, because the mean of its divisors is an integer number (255492900).

Almost surely, 2^1021532521 is an apocalyptic number.

It is an amenable number.

1021532521 is a deficient number, since it is larger than the sum of its proper divisors (439079).

1021532521 is an equidigital number, since it uses as much as digits as its factorization.

1021532521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439078.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1021532521 is about 31961.4223869965. The cubic root of 1021532521 is about 1007.1265979521.

Adding to 1021532521 its reverse (1252351201), we get a palindrome (2273883722).

The spelling of 1021532521 in words is "one billion, twenty-one million, five hundred thirty-two thousand, five hundred twenty-one".