21100425243105 has 32 divisors (see below), whose sum is σ = 36371268702720. Its totient is φ = 10384012258560.

The previous prime is 21100425243091. The next prime is 21100425243109. The reversal of 21100425243105 is 50134252400112.

It is not a de Polignac number, because 21100425243105 - 2⁴ = 21100425243089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21100425243109) 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 31 ways as a sum of consecutive naturals, for example, 19735110 + ... + 20776799.

It is an arithmetic number, because the mean of its divisors is an integer number (1136602146960).

Almost surely, 2^{21100425243105} is an apocalyptic number.

It is an amenable number.

21100425243105 is a deficient number, since it is larger than the sum of its proper divisors (15270843459615).

21100425243105 is a wasteful number, since it uses less digits than its factorization.

21100425243105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40514601.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 21100425243105 its reverse (50134252400112), we get a palindrome (71234677643217).

The spelling of 21100425243105 in words is "twenty-one trillion, one hundred billion, four hundred twenty-five million, two hundred forty-three thousand, one hundred five".