21231302330021 has 12 divisors (see below), whose sum is σ = 25129898874912. Its totient is φ = 17570732957904.

The previous prime is 21231302329957. The next prime is 21231302330047. The reversal of 21231302330021 is 12003320313212.

It is not a de Polignac number, because 21231302330021 - 2⁶ = 21231302329957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231302332021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1803230255 + ... + 1803242028.

It is an arithmetic number, because the mean of its divisors is an integer number (2094158239576).

Almost surely, 2^{21231302330021} is an apocalyptic number.

It is an amenable number.

21231302330021 is a deficient number, since it is larger than the sum of its proper divisors (3898596544891).

21231302330021 is an equidigital number, since it uses as much as digits as its factorization.

21231302330021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3606472348 (or 3606472319 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21231302330021 its reverse (12003320313212), we get a palindrome (33234622643233).

The spelling of 21231302330021 in words is "twenty-one trillion, two hundred thirty-one billion, three hundred two million, three hundred thirty thousand, twenty-one".