21001011010003 has 2 divisors, whose sum is σ = 21001011010004. Its totient is φ = 21001011010002.

The previous prime is 21001011009943. The next prime is 21001011010073. The reversal of 21001011010003 is 30001011010012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21001011010003 - 2³⁷ = 20863572056531 is a prime.

It is not a weakly prime, because it can be changed into another prime (21001011010073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500505505001 + 10500505505002.

It is an arithmetic number, because the mean of its divisors is an integer number (10500505505002).

Almost surely, 2^{21001011010003} is an apocalyptic number.

21001011010003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001011010003 is an equidigital number, since it uses as much as digits as its factorization.

21001011010003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6, while the sum is 10.

Adding to 21001011010003 its reverse (30001011010012), we get a palindrome (51002022020015).

Subtracting 21001011010003 from its reverse (30001011010012), we obtain a palindrome (9000000000009).

The spelling of 21001011010003 in words is "twenty-one trillion, one billion, eleven million, ten thousand, three".