21111010121203 has 4 divisors (see below), whose sum is σ = 21625912807128. Its totient is φ = 20596107435280.

The previous prime is 21111010121189. The next prime is 21111010121219. The reversal of 21111010121203 is 30212101011112.

It is a happy number.

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 21111010121203 - 2⁵ = 21111010121171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111010121273) 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, 257451342901 + ... + 257451342982.

It is an arithmetic number, because the mean of its divisors is an integer number (5406478201782).

Almost surely, 2^{21111010121203} is an apocalyptic number.

21111010121203 is a deficient number, since it is larger than the sum of its proper divisors (514902685925).

21111010121203 is an equidigital number, since it uses as much as digits as its factorization.

21111010121203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514902685924.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21111010121203 its reverse (30212101011112), we get a palindrome (51323111132315).

The spelling of 21111010121203 in words is "twenty-one trillion, one hundred eleven billion, ten million, one hundred twenty-one thousand, two hundred three".