21203031441 has 24 divisors (see below), whose sum is σ = 29112358240. Its totient is φ = 13725144576.

The previous prime is 21203031401. The next prime is 21203031449. The reversal of 21203031441 is 14413030212.

It is not a de Polignac number, because 21203031441 - 2¹⁰ = 21203030417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21203031449) 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 23 ways as a sum of consecutive naturals, for example, 804450 + ... + 830388.

Almost surely, 2^21203031441 is an apocalyptic number.

It is an amenable number.

21203031441 is a deficient number, since it is larger than the sum of its proper divisors (7909326799).

21203031441 is an equidigital number, since it uses as much as digits as its factorization.

21203031441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26145 (or 26092 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21203031441 its reverse (14413030212), we get a palindrome (35616061653).

The spelling of 21203031441 in words is "twenty-one billion, two hundred three million, thirty-one thousand, four hundred forty-one".