21201011003 has 2 divisors, whose sum is σ = 21201011004. Its totient is φ = 21201011002.

The previous prime is 21201010991. The next prime is 21201011087. The reversal of 21201011003 is 30011010212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21201011003 - 2³⁰ = 20127269179 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201011903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600505501 + 10600505502.

It is an arithmetic number, because the mean of its divisors is an integer number (10600505502).

Almost surely, 2^21201011003 is an apocalyptic number.

21201011003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201011003 is an equidigital number, since it uses as much as digits as its factorization.

21201011003 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 11.

Adding to 21201011003 its reverse (30011010212), we get a palindrome (51212021215).

The spelling of 21201011003 in words is "twenty-one billion, two hundred one million, eleven thousand, three".