10521352355021 has 4 divisors (see below), whose sum is σ = 10588367338332. Its totient is φ = 10454337371712.

The previous prime is 10521352354973. The next prime is 10521352355027. The reversal of 10521352355021 is 12055325312501.

It is a happy number.

10521352355021 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1901050833796 + 8620301521225 = 1378786^2 + 2936035^2 .

It is a cyclic number.

It is not a de Polignac number, because 10521352355021 - 2¹⁸ = 10521352092877 is a prime.

It is a super-2 number, since 2×10521352355021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10521352355027) 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, 33507491420 + ... + 33507491733.

It is an arithmetic number, because the mean of its divisors is an integer number (2647091834583).

Almost surely, 2^{10521352355021} is an apocalyptic number.

It is an amenable number.

10521352355021 is a deficient number, since it is larger than the sum of its proper divisors (67014983311).

10521352355021 is an equidigital number, since it uses as much as digits as its factorization.

10521352355021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67014983310.

The product of its (nonzero) digits is 45000, while the sum is 35.

Adding to 10521352355021 its reverse (12055325312501), we get a palindrome (22576677667522).

The spelling of 10521352355021 in words is "ten trillion, five hundred twenty-one billion, three hundred fifty-two million, three hundred fifty-five thousand, twenty-one".