21461109 has 8 divisors (see below), whose sum is σ = 28664832. Its totient is φ = 14282400.

The previous prime is 21461107. The next prime is 21461113. The reversal of 21461109 is 90116412.

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

It is not a de Polignac number, because 21461109 - 2¹ = 21461107 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21461107) 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, 4149 + ... + 7754.

It is an arithmetic number, because the mean of its divisors is an integer number (3583104).

Almost surely, 2^21461109 is an apocalyptic number.

It is an amenable number.

21461109 is a deficient number, since it is larger than the sum of its proper divisors (7203723).

21461109 is a wasteful number, since it uses less digits than its factorization.

21461109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12507.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 21461109 is about 4632.6136251580. The cubic root of 21461109 is about 277.8971247805.

The spelling of 21461109 in words is "twenty-one million, four hundred sixty-one thousand, one hundred nine".