21003120300121 has 8 divisors (see below), whose sum is σ = 22239519748200. Its totient is φ = 19766823272448.

The previous prime is 21003120300103. The next prime is 21003120300131. The reversal of 21003120300121 is 12100302130012.

It can be written as a sum of positive squares in 4 ways, for example, as 2887158298896 + 18115962001225 = 1699164^2 + 4256285^2 .

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

It is not a de Polignac number, because 21003120300121 - 2²³ = 21003111911513 is a prime.

It is a super-2 number, since 2×21003120300121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21003120300095 and 21003120300104.

It is not an unprimeable number, because it can be changed into a prime (21003120300131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25182696 + ... + 26003353.

It is an arithmetic number, because the mean of its divisors is an integer number (2779939968525).

Almost surely, 2^{21003120300121} is an apocalyptic number.

It is an amenable number.

21003120300121 is a deficient number, since it is larger than the sum of its proper divisors (1236399448079).

21003120300121 is a wasteful number, since it uses less digits than its factorization.

21003120300121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51210203.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21003120300121 its reverse (12100302130012), we get a palindrome (33103422430133).

The spelling of 21003120300121 in words is "twenty-one trillion, three billion, one hundred twenty million, three hundred thousand, one hundred twenty-one".