20201070521 has 2 divisors, whose sum is σ = 20201070522. Its totient is φ = 20201070520.

The previous prime is 20201070511. The next prime is 20201070529. The reversal of 20201070521 is 12507010202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11634642496 + 8566428025 = 107864^2 + 92555^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201070521 - 2¹⁸ = 20200808377 is a prime.

It is a super-2 number, since 2×20201070521² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20201070493 and 20201070502.

It is not a weakly prime, because it can be changed into another prime (20201070529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100535260 + 10100535261.

It is an arithmetic number, because the mean of its divisors is an integer number (10100535261).

Almost surely, 2^20201070521 is an apocalyptic number.

It is an amenable number.

20201070521 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201070521 is an equidigital number, since it uses as much as digits as its factorization.

20201070521 is an evil number, because the sum of its binary digits is even.

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

Adding to 20201070521 its reverse (12507010202), we get a palindrome (32708080723).

The spelling of 20201070521 in words is "twenty billion, two hundred one million, seventy thousand, five hundred twenty-one".