21031013020201 has 4 divisors (see below), whose sum is σ = 22268131433172. Its totient is φ = 19793894607232.

The previous prime is 21031013020169. The next prime is 21031013020217. The reversal of 21031013020201 is 10202031013012.

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 5821410817600 + 15209602202601 = 2412760^2 + 3899949^2 .

It is a cyclic number.

It is not a de Polignac number, because 21031013020201 - 2⁵ = 21031013020169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031013020291) 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, 618559206460 + ... + 618559206493.

It is an arithmetic number, because the mean of its divisors is an integer number (5567032858293).

Almost surely, 2^{21031013020201} is an apocalyptic number.

It is an amenable number.

21031013020201 is a deficient number, since it is larger than the sum of its proper divisors (1237118412971).

21031013020201 is a wasteful number, since it uses less digits than its factorization.

21031013020201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237118412970.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21031013020201 its reverse (10202031013012), we get a palindrome (31233044033213).

The spelling of 21031013020201 in words is "twenty-one trillion, thirty-one billion, thirteen million, twenty thousand, two hundred one".