1020521433 has 4 divisors (see below), whose sum is σ = 1360695248. Its totient is φ = 680347620.

The previous prime is 1020521429. The next prime is 1020521443. The reversal of 1020521433 is 3341250201.

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: 3341250201 = 3 ⋅1113750067.

It is not a de Polignac number, because 1020521433 - 2² = 1020521429 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020521443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170086903 + ... + 170086908.

It is an arithmetic number, because the mean of its divisors is an integer number (340173812).

Almost surely, 2^1020521433 is an apocalyptic number.

It is an amenable number.

1020521433 is a deficient number, since it is larger than the sum of its proper divisors (340173815).

1020521433 is an equidigital number, since it uses as much as digits as its factorization.

1020521433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340173814.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1020521433 is about 31945.6011525844. The cubic root of 1020521433 is about 1006.7942118093.

Adding to 1020521433 its reverse (3341250201), we get a palindrome (4361771634).

The spelling of 1020521433 in words is "one billion, twenty million, five hundred twenty-one thousand, four hundred thirty-three".