21427346 has 16 divisors (see below), whose sum is σ = 33359040. Its totient is φ = 10310160.

The previous prime is 21427339. The next prime is 21427349. The reversal of 21427346 is 64372412.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (21427349) 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, 32795 + ... + 33441.

It is an arithmetic number, because the mean of its divisors is an integer number (2084940).

Almost surely, 2^21427346 is an apocalyptic number.

21427346 is a deficient number, since it is larger than the sum of its proper divisors (11931694).

21427346 is a wasteful number, since it uses less digits than its factorization.

21427346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249.

The product of its digits is 8064, while the sum is 29.

The square root of 21427346 is about 4628.9681355568. The cubic root of 21427346 is about 277.7513173847.

Adding to 21427346 its reverse (64372412), we get a palindrome (85799758).

The spelling of 21427346 in words is "twenty-one million, four hundred twenty-seven thousand, three hundred forty-six".