21433845 has 8 divisors (see below), whose sum is σ = 34294176. Its totient is φ = 11431376.

The previous prime is 21433831. The next prime is 21433859. The reversal of 21433845 is 54833412.

It is an interprime number because it is at equal distance from previous prime (21433831) and next prime (21433859).

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 21433845 - 2⁸ = 21433589 is a prime.

It is a super-2 number, since 2×21433845² = 918819422968050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 714447 + ... + 714476.

It is an arithmetic number, because the mean of its divisors is an integer number (4286772).

Almost surely, 2^21433845 is an apocalyptic number.

It is an amenable number.

21433845 is a deficient number, since it is larger than the sum of its proper divisors (12860331).

21433845 is a wasteful number, since it uses less digits than its factorization.

21433845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428931.

The product of its digits is 11520, while the sum is 30.

The square root of 21433845 is about 4629.6700746381. The cubic root of 21433845 is about 277.7793955758.

The spelling of 21433845 in words is "twenty-one million, four hundred thirty-three thousand, eight hundred forty-five".