21384422 has 8 divisors (see below), whose sum is σ = 32161536. Its totient is φ = 10663912.

The previous prime is 21384421. The next prime is 21384449. The reversal of 21384422 is 22448312.

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

It is a junction number, because it is equal to n+sod(n) for n = 21384391 and 21384400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21384421) 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, 13193 + ... + 14724.

It is an arithmetic number, because the mean of its divisors is an integer number (4020192).

Almost surely, 2^21384422 is an apocalyptic number.

21384422 is a deficient number, since it is larger than the sum of its proper divisors (10777114).

21384422 is a wasteful number, since it uses less digits than its factorization.

21384422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28302.

The product of its digits is 3072, while the sum is 26.

The square root of 21384422 is about 4624.3293567825. The cubic root of 21384422 is about 277.5657263895.

The spelling of 21384422 in words is "twenty-one million, three hundred eighty-four thousand, four hundred twenty-two".