21230041021 has 8 divisors (see below), whose sum is σ = 24263792384. Its totient is φ = 18196511760.

The previous prime is 21230041013. The next prime is 21230041051. The reversal of 21230041021 is 12014003212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21230041021 - 2³ = 21230041013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21230040986 and 21230041004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230041051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307951 + ... + 370531.

It is an arithmetic number, because the mean of its divisors is an integer number (3032974048).

Almost surely, 2^21230041021 is an apocalyptic number.

It is an amenable number.

21230041021 is a deficient number, since it is larger than the sum of its proper divisors (3033751363).

21230041021 is an equidigital number, since it uses as much as digits as its factorization.

21230041021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111051.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21230041021 its reverse (12014003212), we get a palindrome (33244044233).

The spelling of 21230041021 in words is "twenty-one billion, two hundred thirty million, forty-one thousand, twenty-one".