21131420202103 has 16 divisors (see below), whose sum is σ = 22317953405440. Its totient is φ = 19952333424000.

The previous prime is 21131420202071. The next prime is 21131420202121. The reversal of 21131420202103 is 30120202413112.

It is a cyclic number.

It is not a de Polignac number, because 21131420202103 - 2⁵ = 21131420202071 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 (21131420202803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71253778 + ... + 71549728.

It is an arithmetic number, because the mean of its divisors is an integer number (1394872087840).

Almost surely, 2^{21131420202103} is an apocalyptic number.

21131420202103 is a deficient number, since it is larger than the sum of its proper divisors (1186533203337).

21131420202103 is a wasteful number, since it uses less digits than its factorization.

21131420202103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308518.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21131420202103 its reverse (30120202413112), we get a palindrome (51251622615215).

The spelling of 21131420202103 in words is "twenty-one trillion, one hundred thirty-one billion, four hundred twenty million, two hundred two thousand, one hundred three".