21011101 has 8 divisors (see below), whose sum is σ = 21470400. Its totient is φ = 20556480.

The previous prime is 21011083. The next prime is 21011141. The reversal of 21011101 is 10111012.

21011101 = T₇₆ + T₇₇ + ... + T₅₀₁.

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 21011101 - 2⁷ = 21010973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8805 + ... + 10933.

It is an arithmetic number, because the mean of its divisors is an integer number (2683800).

Almost surely, 2^21011101 is an apocalyptic number.

It is an amenable number.

21011101 is a deficient number, since it is larger than the sum of its proper divisors (459299).

21011101 is a wasteful number, since it uses less digits than its factorization.

21011101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2339.

The product of its (nonzero) digits is 2, while the sum is 7.

The square root of 21011101 is about 4583.7867533296. The cubic root of 21011101 is about 275.9410230702.

Adding to 21011101 its reverse (10111012), we get a palindrome (31122113).

Multiplying 21011101 by its reverse (10111012), we get a palindrome (212443494344212).

It can be divided in two parts, 21011 and 101, that added together give a palindrome (21112).

The spelling of 21011101 in words is "twenty-one million, eleven thousand, one hundred one".