21003103121121 has 24 divisors (see below), whose sum is σ = 34837683011040. Its totient is φ = 12059197963200.

The previous prime is 21003103121113. The next prime is 21003103121191. The reversal of 21003103121121 is 12112130130012.

21003103121121 is a `hidden beast` number, since 2 + 10 + 0 + 310 + 312 + 11 + 21 = 666.

It is not a de Polignac number, because 21003103121121 - 2³ = 21003103121113 is a prime.

It is a super-2 number, since 2×21003103121121² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003103121094 and 21003103121103.

It is not an unprimeable number, because it can be changed into a prime (21003103121191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5582960140 + ... + 5582963901.

It is an arithmetic number, because the mean of its divisors is an integer number (1451570125460).

Almost surely, 2^{21003103121121} is an apocalyptic number.

It is an amenable number.

21003103121121 is a deficient number, since it is larger than the sum of its proper divisors (13834579889919).

21003103121121 is a wasteful number, since it uses less digits than its factorization.

21003103121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11165924077 (or 11165924074 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21003103121121 its reverse (12112130130012), we get a palindrome (33115233251133).

The spelling of 21003103121121 in words is "twenty-one trillion, three billion, one hundred three million, one hundred twenty-one thousand, one hundred twenty-one".