21384051 has 8 divisors (see below), whose sum is σ = 30705360. Its totient is φ = 13159392.

The previous prime is 21383969. The next prime is 21384061. The reversal of 21384051 is 15048312.

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

It is not a de Polignac number, because 21384051 - 2²² = 17189747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21384061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274116 + ... + 274193.

It is an arithmetic number, because the mean of its divisors is an integer number (3838170).

Almost surely, 2^21384051 is an apocalyptic number.

21384051 is a deficient number, since it is larger than the sum of its proper divisors (9321309).

21384051 is a wasteful number, since it uses less digits than its factorization.

21384051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548325.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 21384051 is about 4624.2892426837. The cubic root of 21384051 is about 277.5641212105.

The spelling of 21384051 in words is "twenty-one million, three hundred eighty-four thousand, fifty-one".