21422342 has 8 divisors (see below), whose sum is σ = 32880936. Its totient is φ = 10462032.

The previous prime is 21422341. The next prime is 21422347. The reversal of 21422342 is 24322412.

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 (21422341) 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, 124463 + ... + 124634.

It is an arithmetic number, because the mean of its divisors is an integer number (4110117).

Almost surely, 2^21422342 is an apocalyptic number.

21422342 is a deficient number, since it is larger than the sum of its proper divisors (11458594).

21422342 is a wasteful number, since it uses less digits than its factorization.

21422342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249142.

The product of its digits is 768, while the sum is 20.

The square root of 21422342 is about 4628.4275947669. The cubic root of 21422342 is about 277.7296943024.

Adding to 21422342 its reverse (24322412), we get a palindrome (45744754).

The spelling of 21422342 in words is "twenty-one million, four hundred twenty-two thousand, three hundred forty-two".