10019521 has 4 divisors (see below), whose sum is σ = 10037700. Its totient is φ = 10001344.

The previous prime is 10019519. The next prime is 10019533. The reversal of 10019521 is 12591001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12591001 = 607 ⋅20743.

It can be written as a sum of positive squares in 2 ways, for example, as 4431025 + 5588496 = 2105^2 + 2364^2 .

It is a cyclic number.

It is not a de Polignac number, because 10019521 - 2¹ = 10019519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10019501) 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, 8236 + ... + 9373.

It is an arithmetic number, because the mean of its divisors is an integer number (2509425).

Almost surely, 2^10019521 is an apocalyptic number.

It is an amenable number.

10019521 is a deficient number, since it is larger than the sum of its proper divisors (18179).

10019521 is an equidigital number, since it uses as much as digits as its factorization.

10019521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18178.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 10019521 is about 3165.3626964378. The cubic root of 10019521 is about 215.5835669462.

The spelling of 10019521 in words is "ten million, nineteen thousand, five hundred twenty-one".