21401103 has 4 divisors (see below), whose sum is σ = 28534808. Its totient is φ = 14267400.

The previous prime is 21401089. The next prime is 21401111. The reversal of 21401103 is 30110412.

It is a happy number.

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

It is not a de Polignac number, because 21401103 - 2⁵ = 21401071 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 (21401123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3566848 + ... + 3566853.

It is an arithmetic number, because the mean of its divisors is an integer number (7133702).

Almost surely, 2^21401103 is an apocalyptic number.

21401103 is a deficient number, since it is larger than the sum of its proper divisors (7133705).

21401103 is an equidigital number, since it uses as much as digits as its factorization.

21401103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7133704.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21401103 is about 4626.1326180731. The cubic root of 21401103 is about 277.6378796997.

Adding to 21401103 its reverse (30110412), we get a palindrome (51511515).

The spelling of 21401103 in words is "twenty-one million, four hundred one thousand, one hundred three".