21000230310021 has 8 divisors (see below), whose sum is σ = 28000341729984. Its totient is φ = 14000136215040.

The previous prime is 21000230310019. The next prime is 21000230310023. The reversal of 21000230310021 is 12001303200012.

It is an interprime number because it is at equal distance from previous prime (21000230310019) and next prime (21000230310023).

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

It is not a de Polignac number, because 21000230310021 - 2¹ = 21000230310019 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000230310023) 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, 1174185 + ... + 6586286.

It is an arithmetic number, because the mean of its divisors is an integer number (3500042716248).

Almost surely, 2^{21000230310021} is an apocalyptic number.

It is an amenable number.

21000230310021 is a deficient number, since it is larger than the sum of its proper divisors (7000111419963).

21000230310021 is an equidigital number, since it uses as much as digits as its factorization.

21000230310021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8662491.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21000230310021 its reverse (12001303200012), we get a palindrome (33001533510033).

The spelling of 21000230310021 in words is "twenty-one trillion, two hundred thirty million, three hundred ten thousand, twenty-one".