21738854 has 4 divisors (see below), whose sum is σ = 32608284. Its totient is φ = 10869426.

The previous prime is 21738853. The next prime is 21738877. The reversal of 21738854 is 45883712.

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 (21738853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5434712 + ... + 5434715.

It is an arithmetic number, because the mean of its divisors is an integer number (8152071).

Almost surely, 2^21738854 is an apocalyptic number.

21738854 is a deficient number, since it is larger than the sum of its proper divisors (10869430).

21738854 is a wasteful number, since it uses less digits than its factorization.

21738854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10869429.

The product of its digits is 53760, while the sum is 38.

The square root of 21738854 is about 4662.4943967795. The cubic root of 21738854 is about 279.0908180168.

The spelling of 21738854 in words is "twenty-one million, seven hundred thirty-eight thousand, eight hundred fifty-four".