21100403003 has 2 divisors, whose sum is σ = 21100403004. Its totient is φ = 21100403002.

The previous prime is 21100402993. The next prime is 21100403029. The reversal of 21100403003 is 30030400112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21100403003 - 2²⁸ = 20831967547 is a prime.

It is a super-2 number, since 2×21100403003² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21100403033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550201501 + 10550201502.

It is an arithmetic number, because the mean of its divisors is an integer number (10550201502).

Almost surely, 2^21100403003 is an apocalyptic number.

21100403003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100403003 is an equidigital number, since it uses as much as digits as its factorization.

21100403003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21100403003 its reverse (30030400112), we get a palindrome (51130803115).

The spelling of 21100403003 in words is "twenty-one billion, one hundred million, four hundred three thousand, three".