21121100300203 has 4 divisors (see below), whose sum is σ = 21215813754688. Its totient is φ = 21026386845720.

The previous prime is 21121100300197. The next prime is 21121100300213. The reversal of 21121100300203 is 30200300112112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21121100300203 - 2²⁵ = 21121066745771 is a prime.

It is a super-2 number, since 2×21121100300203² (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 (21121100300213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47356726908 + ... + 47356727353.

It is an arithmetic number, because the mean of its divisors is an integer number (5303953438672).

Almost surely, 2^{21121100300203} is an apocalyptic number.

21121100300203 is a deficient number, since it is larger than the sum of its proper divisors (94713454485).

21121100300203 is an equidigital number, since it uses as much as digits as its factorization.

21121100300203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94713454484.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21121100300203 its reverse (30200300112112), we get a palindrome (51321400412315).

The spelling of 21121100300203 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred million, three hundred thousand, two hundred three".