21300210121 has 8 divisors (see below), whose sum is σ = 21720540744. Its totient is φ = 20880562560.

The previous prime is 21300210109. The next prime is 21300210157. The reversal of 21300210121 is 12101200312.

It can be written as a sum of positive squares in 4 ways, for example, as 12824430025 + 8475780096 = 113245^2 + 92064^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21300210121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21300216121) 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, 107556 + ... + 232741.

It is an arithmetic number, because the mean of its divisors is an integer number (2715067593).

Almost surely, 2^21300210121 is an apocalyptic number.

It is an amenable number.

21300210121 is a deficient number, since it is larger than the sum of its proper divisors (420330623).

21300210121 is a wasteful number, since it uses less digits than its factorization.

21300210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341531.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21300210121 its reverse (12101200312), we get a palindrome (33401410433).

The spelling of 21300210121 in words is "twenty-one billion, three hundred million, two hundred ten thousand, one hundred twenty-one".