10020512521 has 8 divisors (see below), whose sum is σ = 10643857704. Its totient is φ = 9400934400.

The previous prime is 10020512507. The next prime is 10020512527. The reversal of 10020512521 is 12521502001.

It can be written as a sum of positive squares in 4 ways, for example, as 409455225 + 9611057296 = 20235^2 + 98036^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10020512521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10020512527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 936280 + ... + 946921.

It is an arithmetic number, because the mean of its divisors is an integer number (1330482213).

Almost surely, 2^10020512521 is an apocalyptic number.

It is an amenable number.

10020512521 is a deficient number, since it is larger than the sum of its proper divisors (623345183).

10020512521 is a wasteful number, since it uses less digits than its factorization.

10020512521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1883531.

The product of its (nonzero) digits is 200, while the sum is 19.

The spelling of 10020512521 in words is "ten billion, twenty million, five hundred twelve thousand, five hundred twenty-one".