21011001121003 has 2 divisors, whose sum is σ = 21011001121004. Its totient is φ = 21011001121002.

The previous prime is 21011001121001. The next prime is 21011001121007. The reversal of 21011001121003 is 30012110011012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21011001121003 - 2¹ = 21011001121001 is a prime.

Together with 21011001121001, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21011001121001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505500560501 + 10505500560502.

It is an arithmetic number, because the mean of its divisors is an integer number (10505500560502).

Almost surely, 2^{21011001121003} is an apocalyptic number.

21011001121003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011001121003 is an equidigital number, since it uses as much as digits as its factorization.

21011001121003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21011001121003 its reverse (30012110011012), we get a palindrome (51023111132015).

The spelling of 21011001121003 in words is "twenty-one trillion, eleven billion, one million, one hundred twenty-one thousand, three".