21384101 has 4 divisors (see below), whose sum is σ = 22509600. Its totient is φ = 20258604.

The previous prime is 21384073. The next prime is 21384151. The reversal of 21384101 is 10148312.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21384101 is a prime.

It is a Duffinian 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 (21384151) 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, 562721 + ... + 562758.

It is an arithmetic number, because the mean of its divisors is an integer number (5627400).

Almost surely, 2^21384101 is an apocalyptic number.

It is an amenable number.

21384101 is a deficient number, since it is larger than the sum of its proper divisors (1125499).

21384101 is a wasteful number, since it uses less digits than its factorization.

21384101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125498.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 21384101 is about 4624.2946489167. The cubic root of 21384101 is about 277.5643375429.

The spelling of 21384101 in words is "twenty-one million, three hundred eighty-four thousand, one hundred one".