21100023003 has 16 divisors (see below), whose sum is σ = 28532695040. Its totient is φ = 13867205184.

The previous prime is 21100022929. The next prime is 21100023011. The reversal of 21100023003 is 30032000112.

It is a happy number.

It is not a de Polignac number, because 21100023003 - 2¹⁶ = 21099957467 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21100023003.

It is not an unprimeable number, because it can be changed into a prime (21100023803) 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 15 ways as a sum of consecutive naturals, for example, 446838 + ... + 491796.

It is an arithmetic number, because the mean of its divisors is an integer number (1783293440).

Almost surely, 2^21100023003 is an apocalyptic number.

21100023003 is a deficient number, since it is larger than the sum of its proper divisors (7432672037).

21100023003 is a wasteful number, since it uses less digits than its factorization.

21100023003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47178.

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21100023003 its reverse (30032000112), we get a palindrome (51132023115).

The spelling of 21100023003 in words is "twenty-one billion, one hundred million, twenty-three thousand, three".