21031013221001 has 24 divisors (see below), whose sum is σ = 24891319621440. Its totient is φ = 17712801943200.

The previous prime is 21031013220991. The next prime is 21031013221019. The reversal of 21031013221001 is 10012231013012.

It is a de Polignac number, because none of the positive numbers 2^k-21031013221001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031013221061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 720821 + ... + 6525458.

It is an arithmetic number, because the mean of its divisors is an integer number (1037138317560).

Almost surely, 2^{21031013221001} is an apocalyptic number.

It is an amenable number.

21031013221001 is a deficient number, since it is larger than the sum of its proper divisors (3860306400439).

21031013221001 is an equidigital number, since it uses as much as digits as its factorization.

21031013221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7247325 (or 7247318 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21031013221001 its reverse (10012231013012), we get a palindrome (31043244234013).

The spelling of 21031013221001 in words is "twenty-one trillion, thirty-one billion, thirteen million, two hundred twenty-one thousand, one".