21020231441 has 16 divisors (see below), whose sum is σ = 23413459200. Its totient is φ = 18867317040.

The previous prime is 21020231437. The next prime is 21020231459. The reversal of 21020231441 is 14413202012.

It is not a de Polignac number, because 21020231441 - 2² = 21020231437 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020231041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5195 + ... + 205103.

It is an arithmetic number, because the mean of its divisors is an integer number (1463341200).

Almost surely, 2^21020231441 is an apocalyptic number.

It is an amenable number.

21020231441 is a deficient number, since it is larger than the sum of its proper divisors (2393227759).

21020231441 is an equidigital number, since it uses as much as digits as its factorization.

21020231441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200021 (or 199999 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21020231441 its reverse (14413202012), we get a palindrome (35433433453).

The spelling of 21020231441 in words is "twenty-one billion, twenty million, two hundred thirty-one thousand, four hundred forty-one".