21426430 has 8 divisors (see below), whose sum is σ = 38567592. Its totient is φ = 8570568.

The previous prime is 21426421. The next prime is 21426437. The reversal of 21426430 is 3462412.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21426437) 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, 1071312 + ... + 1071331.

It is an arithmetic number, because the mean of its divisors is an integer number (4820949).

Almost surely, 2^21426430 is an apocalyptic number.

21426430 is a deficient number, since it is larger than the sum of its proper divisors (17141162).

21426430 is a wasteful number, since it uses less digits than its factorization.

21426430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2142650.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 21426430 is about 4628.8691923622. The cubic root of 21426430 is about 277.7473594543.

Adding to 21426430 its reverse (3462412), we get a palindrome (24888842).

The spelling of 21426430 in words is "twenty-one million, four hundred twenty-six thousand, four hundred thirty".