21422355 has 8 divisors (see below), whose sum is σ = 34275792. Its totient is φ = 11425248.

The previous prime is 21422347. The next prime is 21422381. The reversal of 21422355 is 55322412.

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

It is not a de Polignac number, because 21422355 - 2³ = 21422347 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 714064 + ... + 714093.

It is an arithmetic number, because the mean of its divisors is an integer number (4284474).

Almost surely, 2^21422355 is an apocalyptic number.

21422355 is a deficient number, since it is larger than the sum of its proper divisors (12853437).

21422355 is a wasteful number, since it uses less digits than its factorization.

21422355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428165.

The product of its digits is 2400, while the sum is 24.

The square root of 21422355 is about 4628.4289991313. The cubic root of 21422355 is about 277.7297504818.

Adding to 21422355 its reverse (55322412), we get a palindrome (76744767).

The spelling of 21422355 in words is "twenty-one million, four hundred twenty-two thousand, three hundred fifty-five".