21043101 has 4 divisors (see below), whose sum is σ = 28057472. Its totient is φ = 14028732.

The previous prime is 21043097. The next prime is 21043111. The reversal of 21043101 is 10134012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21043101 - 2² = 21043097 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 (21043111) 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, 3507181 + ... + 3507186.

It is an arithmetic number, because the mean of its divisors is an integer number (7014368).

Almost surely, 2^21043101 is an apocalyptic number.

It is an amenable number.

21043101 is a deficient number, since it is larger than the sum of its proper divisors (7014371).

21043101 is an equidigital number, since it uses as much as digits as its factorization.

21043101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7014370.

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

The square root of 21043101 is about 4587.2759890811. The cubic root of 21043101 is about 276.0810384802.

Adding to 21043101 its reverse (10134012), we get a palindrome (31177113).

The spelling of 21043101 in words is "twenty-one million, forty-three thousand, one hundred one".