21101100020203 has 32 divisors (see below), whose sum is σ = 26358571819008. Its totient is φ = 16473123878400.

The previous prime is 21101100020149. The next prime is 21101100020227. The reversal of 21101100020203 is 30202000110112.

It is not a de Polignac number, because 21101100020203 - 2²⁹ = 21100563149291 is a prime.

It is a super-2 number, since 2×21101100020203² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101100020603) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168771973 + ... + 168896953.

It is an arithmetic number, because the mean of its divisors is an integer number (823705369344).

Almost surely, 2^{21101100020203} is an apocalyptic number.

21101100020203 is a deficient number, since it is larger than the sum of its proper divisors (5257471798805).

21101100020203 is a wasteful number, since it uses less digits than its factorization.

21101100020203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170803.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21101100020203 its reverse (30202000110112), we get a palindrome (51303100130315).

The spelling of 21101100020203 in words is "twenty-one trillion, one hundred one billion, one hundred million, twenty thousand, two hundred three".