21450118 has 4 divisors (see below), whose sum is σ = 32175180. Its totient is φ = 10725058.

The previous prime is 21450113. The next prime is 21450119. The reversal of 21450118 is 81105412.

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 (21450113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5362528 + ... + 5362531.

It is an arithmetic number, because the mean of its divisors is an integer number (8043795).

Almost surely, 2^21450118 is an apocalyptic number.

21450118 is a deficient number, since it is larger than the sum of its proper divisors (10725062).

21450118 is a wasteful number, since it uses less digits than its factorization.

21450118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10725061.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 21450118 is about 4631.4272098350. The cubic root of 21450118 is about 277.8496763337.

The spelling of 21450118 in words is "twenty-one million, four hundred fifty thousand, one hundred eighteen".