21113123101 has 8 divisors (see below), whose sum is σ = 24469133184. Its totient is φ = 17842075440.

The previous prime is 21113123099. The next prime is 21113123107. The reversal of 21113123101 is 10132131112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21113123101 - 2¹ = 21113123099 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 (21113123107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21240070 + ... + 21241063.

It is an arithmetic number, because the mean of its divisors is an integer number (3058641648).

Almost surely, 2^21113123101 is an apocalyptic number.

It is an amenable number.

21113123101 is a deficient number, since it is larger than the sum of its proper divisors (3356010083).

21113123101 is an equidigital number, since it uses as much as digits as its factorization.

21113123101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42481211.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21113123101 its reverse (10132131112), we get a palindrome (31245254213).

The spelling of 21113123101 in words is "twenty-one billion, one hundred thirteen million, one hundred twenty-three thousand, one hundred one".