10020521 has 4 divisors (see below), whose sum is σ = 11452032. Its totient is φ = 8589012.

The previous prime is 10020509. The next prime is 10020547. The reversal of 10020521 is 12502001.

10020521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 10020521 - 2¹⁰ = 10019497 is a prime.

It is a super-2 number, since 2×10020521² = 200821682222882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10020121) 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, 715745 + ... + 715758.

It is an arithmetic number, because the mean of its divisors is an integer number (2863008).

Almost surely, 2^10020521 is an apocalyptic number.

It is an amenable number.

10020521 is a deficient number, since it is larger than the sum of its proper divisors (1431511).

10020521 is an equidigital number, since it uses as much as digits as its factorization.

10020521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431510.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 10020521 is about 3165.5206522782. The cubic root of 10020521 is about 215.5907388259.

Adding to 10020521 its reverse (12502001), we get a palindrome (22522522).

The spelling of 10020521 in words is "ten million, twenty thousand, five hundred twenty-one".