21446047 has 8 divisors (see below), whose sum is σ = 24855552. Its totient is φ = 18123000.

The previous prime is 21446039. The next prime is 21446059. The reversal of 21446047 is 74064412.

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

It is not a de Polignac number, because 21446047 - 2³ = 21446039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443047) 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, 21079 + ... + 22072.

It is an arithmetic number, because the mean of its divisors is an integer number (3106944).

Almost surely, 2^21446047 is an apocalyptic number.

21446047 is a deficient number, since it is larger than the sum of its proper divisors (3409505).

21446047 is an equidigital number, since it uses as much as digits as its factorization.

21446047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43229.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 21446047 is about 4630.9876916269. The cubic root of 21446047 is about 277.8320976022.

The spelling of 21446047 in words is "twenty-one million, four hundred forty-six thousand, forty-seven".