21468878 has 8 divisors (see below), whose sum is σ = 32417040. Its totient is φ = 10663200.

The previous prime is 21468829. The next prime is 21468899. The reversal of 21468878 is 87886412.

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

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, 35243 + ... + 35846.

It is an arithmetic number, because the mean of its divisors is an integer number (4052130).

Almost surely, 2^21468878 is an apocalyptic number.

21468878 is a deficient number, since it is larger than the sum of its proper divisors (10948162).

21468878 is a wasteful number, since it uses less digits than its factorization.

21468878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71242.

The product of its digits is 172032, while the sum is 44.

The square root of 21468878 is about 4633.4520608289. The cubic root of 21468878 is about 277.9306539937.

The spelling of 21468878 in words is "twenty-one million, four hundred sixty-eight thousand, eight hundred seventy-eight".