21450794 has 4 divisors (see below), whose sum is σ = 32176194. Its totient is φ = 10725396.

The previous prime is 21450763. The next prime is 21450797. The reversal of 21450794 is 49705412.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 14922769 + 6528025 = 3863^2 + 2555^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21450794.

It is not an unprimeable number, because it can be changed into a prime (21450797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5362697 + ... + 5362700.

Almost surely, 2^21450794 is an apocalyptic number.

21450794 is a deficient number, since it is larger than the sum of its proper divisors (10725400).

21450794 is a wasteful number, since it uses less digits than its factorization.

21450794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10725399.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 21450794 is about 4631.5001889237. The cubic root of 21450794 is about 277.8525951119.

The spelling of 21450794 in words is "twenty-one million, four hundred fifty thousand, seven hundred ninety-four".