21100220203 has 8 divisors (see below), whose sum is σ = 21184084656. Its totient is φ = 21016512000.

The previous prime is 21100220201. The next prime is 21100220227. The reversal of 21100220203 is 30202200112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21100220203 - 2¹ = 21100220201 is a prime.

It is a super-2 number, since 2×21100220203² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100220201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235363 + ... + 312403.

It is an arithmetic number, because the mean of its divisors is an integer number (2648010582).

Almost surely, 2^21100220203 is an apocalyptic number.

21100220203 is a deficient number, since it is larger than the sum of its proper divisors (83864453).

21100220203 is an equidigital number, since it uses as much as digits as its factorization.

21100220203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78125.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21100220203 its reverse (30202200112), we get a palindrome (51302420315).

The spelling of 21100220203 in words is "twenty-one billion, one hundred million, two hundred twenty thousand, two hundred three".