21010507373285 has 16 divisors (see below), whose sum is σ = 25246596781296. Its totient is φ = 16785748482048.

The previous prime is 21010507373269. The next prime is 21010507373287. The reversal of 21010507373285 is 58237370501012.

It is a Cunningham number, because it is equal to 4583722²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 1 + 21010507373284 = 1^2 + 4583722^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010507373285 - 2⁴ = 21010507373269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010507373287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252012827 + ... + 252096183.

It is an arithmetic number, because the mean of its divisors is an integer number (1577912298831).

Almost surely, 2^{21010507373285} is an apocalyptic number.

It is an amenable number.

21010507373285 is a deficient number, since it is larger than the sum of its proper divisors (4236089408011).

21010507373285 is an equidigital number, since it uses as much as digits as its factorization.

21010507373285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150712.

The product of its (nonzero) digits is 352800, while the sum is 44.

Adding to 21010507373285 its reverse (58237370501012), we get a palindrome (79247877874297).

The spelling of 21010507373285 in words is "twenty-one trillion, ten billion, five hundred seven million, three hundred seventy-three thousand, two hundred eighty-five".