21384233 has 8 divisors (see below), whose sum is σ = 23234568. Its totient is φ = 19563264.

The previous prime is 21384229. The next prime is 21384241. The reversal of 21384233 is 33248312.

It can be written as a sum of positive squares in 4 ways, for example, as 2050624 + 19333609 = 1432^2 + 4397^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21384233 - 2² = 21384229 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21384263) 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, 5810 + ... + 8747.

It is an arithmetic number, because the mean of its divisors is an integer number (2904321).

Almost surely, 2^21384233 is an apocalyptic number.

It is an amenable number.

21384233 is a deficient number, since it is larger than the sum of its proper divisors (1850335).

21384233 is a wasteful number, since it uses less digits than its factorization.

21384233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14683.

The product of its digits is 3456, while the sum is 26.

The square root of 21384233 is about 4624.3089213417. The cubic root of 21384233 is about 277.5649086591.

The spelling of 21384233 in words is "twenty-one million, three hundred eighty-four thousand, two hundred thirty-three".