21101031003 has 32 divisors (see below), whose sum is σ = 30489209856. Its totient is φ = 12903948288.

The previous prime is 21101030983. The next prime is 21101031019. The reversal of 21101031003 is 30013010112.

It is not a de Polignac number, because 21101031003 - 2¹² = 21101026907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21101031003.

It is not an unprimeable number, because it can be changed into a prime (21101031073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4638376 + ... + 4642922.

It is an arithmetic number, because the mean of its divisors is an integer number (952787808).

Almost surely, 2^21101031003 is an apocalyptic number.

21101031003 is a deficient number, since it is larger than the sum of its proper divisors (9388178853).

21101031003 is a wasteful number, since it uses less digits than its factorization.

21101031003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5283.

The product of its (nonzero) digits is 18, while the sum is 12.

Adding to 21101031003 its reverse (30013010112), we get a palindrome (51114041115).

The spelling of 21101031003 in words is "twenty-one billion, one hundred one million, thirty-one thousand, three".