21401101 has 4 divisors (see below), whose sum is σ = 22139100. Its totient is φ = 20663104.

The previous prime is 21401089. The next prime is 21401111. The reversal of 21401101 is 10110412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11383876 + 10017225 = 3374^2 + 3165^2 .

It is a cyclic number.

It is not a de Polignac number, because 21401101 - 2⁵ = 21401069 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 (21401111) 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 3 ways as a sum of consecutive naturals, for example, 368956 + ... + 369013.

It is an arithmetic number, because the mean of its divisors is an integer number (5534775).

Almost surely, 2^21401101 is an apocalyptic number.

It is an amenable number.

21401101 is a deficient number, since it is larger than the sum of its proper divisors (737999).

21401101 is an equidigital number, since it uses as much as digits as its factorization.

21401101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737998.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 21401101 is about 4626.1324019098. The cubic root of 21401101 is about 277.6378710510.

Adding to 21401101 its reverse (10110412), we get a palindrome (31511513).

The spelling of 21401101 in words is "twenty-one million, four hundred one thousand, one hundred one".