21131231124103 has 4 divisors (see below), whose sum is σ = 21207517157320. Its totient is φ = 21054945090888.

The previous prime is 21131231124079. The next prime is 21131231124121. The reversal of 21131231124103 is 30142113213112.

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 21131231124103 - 2⁹ = 21131231123591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131231124803) 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, 38143016193 + ... + 38143016746.

It is an arithmetic number, because the mean of its divisors is an integer number (5301879289330).

Almost surely, 2^{21131231124103} is an apocalyptic number.

21131231124103 is a deficient number, since it is larger than the sum of its proper divisors (76286033217).

21131231124103 is an equidigital number, since it uses as much as digits as its factorization.

21131231124103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76286033216.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 21131231124103 its reverse (30142113213112), we get a palindrome (51273344337215).

The spelling of 21131231124103 in words is "twenty-one trillion, one hundred thirty-one billion, two hundred thirty-one million, one hundred twenty-four thousand, one hundred three".