21346678 has 4 divisors (see below), whose sum is σ = 32020020. Its totient is φ = 10673338.

The previous prime is 21346673. The next prime is 21346681. The reversal of 21346678 is 87664312.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21346673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5336668 + ... + 5336671.

It is an arithmetic number, because the mean of its divisors is an integer number (8005005).

Almost surely, 2^21346678 is an apocalyptic number.

21346678 is a deficient number, since it is larger than the sum of its proper divisors (10673342).

21346678 is a wasteful number, since it uses less digits than its factorization.

21346678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10673341.

The product of its digits is 48384, while the sum is 37.

The square root of 21346678 is about 4620.2465302189. The cubic root of 21346678 is about 277.4023269057.

The spelling of 21346678 in words is "twenty-one million, three hundred forty-six thousand, six hundred seventy-eight".