21100012203 has 16 divisors (see below), whose sum is σ = 28445741856. Its totient is φ = 13910707200.

The previous prime is 21100012189. The next prime is 21100012249. The reversal of 21100012203 is 30221000112.

It is not a de Polignac number, because 21100012203 - 2¹² = 21100008107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21100012253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 350725 + ... + 406457.

It is an arithmetic number, because the mean of its divisors is an integer number (1777858866).

Almost surely, 2^21100012203 is an apocalyptic number.

21100012203 is a deficient number, since it is larger than the sum of its proper divisors (7345729653).

21100012203 is a wasteful number, since it uses less digits than its factorization.

21100012203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57134.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21100012203 its reverse (30221000112), we get a palindrome (51321012315).

The spelling of 21100012203 in words is "twenty-one billion, one hundred million, twelve thousand, two hundred three".