21422678 has 8 divisors (see below), whose sum is σ = 32167800. Its totient is φ = 10700080.

The previous prime is 21422641. The next prime is 21422689. The reversal of 21422678 is 87622412.

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

It is a super-2 number, since 2×21422678² = 917862265383368, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3008 + ... + 7203.

It is an arithmetic number, because the mean of its divisors is an integer number (4020975).

Almost surely, 2^21422678 is an apocalyptic number.

21422678 is a deficient number, since it is larger than the sum of its proper divisors (10745122).

21422678 is a wasteful number, since it uses less digits than its factorization.

21422678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11262.

The product of its digits is 10752, while the sum is 32.

The square root of 21422678 is about 4628.4638920489. The cubic root of 21422678 is about 277.7311463174.

The spelling of 21422678 in words is "twenty-one million, four hundred twenty-two thousand, six hundred seventy-eight".