21001112101 has 8 divisors (see below), whose sum is σ = 21283758720. Its totient is φ = 20719170912.

The previous prime is 21001112071. The next prime is 21001112117. The reversal of 21001112101 is 10121110012.

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

It is a cyclic number.

It is not a de Polignac number, because 21001112101 - 2¹³ = 21001103909 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 (21001112141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116280 + ... + 235633.

It is an arithmetic number, because the mean of its divisors is an integer number (2660469840).

Almost surely, 2^21001112101 is an apocalyptic number.

It is an amenable number.

21001112101 is a deficient number, since it is larger than the sum of its proper divisors (282646619).

21001112101 is an equidigital number, since it uses as much as digits as its factorization.

21001112101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352715.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21001112101 its reverse (10121110012), we get a palindrome (31122222113).

The spelling of 21001112101 in words is "twenty-one billion, one million, one hundred twelve thousand, one hundred one".