10520207021 has 4 divisors (see below), whose sum is σ = 10520470044. Its totient is φ = 10519944000.

The previous prime is 10520207017. The next prime is 10520207029. The reversal of 10520207021 is 12070202501.

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 1205061796 + 9315145225 = 34714^2 + 96515^2 .

It is a cyclic number.

It is not a de Polignac number, because 10520207021 - 2² = 10520207017 is a prime.

It is a super-2 number, since 2×10520207021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10520206984 and 10520207002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10520207029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57710 + ... + 156111.

It is an arithmetic number, because the mean of its divisors is an integer number (2630117511).

Almost surely, 2^10520207021 is an apocalyptic number.

It is an amenable number.

10520207021 is a deficient number, since it is larger than the sum of its proper divisors (263023).

10520207021 is an equidigital number, since it uses as much as digits as its factorization.

10520207021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263022.

The product of its (nonzero) digits is 280, while the sum is 20.

Adding to 10520207021 its reverse (12070202501), we get a palindrome (22590409522).

The spelling of 10520207021 in words is "ten billion, five hundred twenty million, two hundred seven thousand, twenty-one".