21450358 has 4 divisors (see below), whose sum is σ = 32175540. Its totient is φ = 10725178.

The previous prime is 21450353. The next prime is 21450367. The reversal of 21450358 is 85305412.

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 (21450353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5362588 + ... + 5362591.

It is an arithmetic number, because the mean of its divisors is an integer number (8043885).

Almost surely, 2^21450358 is an apocalyptic number.

21450358 is a deficient number, since it is larger than the sum of its proper divisors (10725182).

21450358 is a wasteful number, since it uses less digits than its factorization.

21450358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10725181.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 21450358 is about 4631.4531197023. The cubic root of 21450358 is about 277.8507125934.

The spelling of 21450358 in words is "twenty-one million, four hundred fifty thousand, three hundred fifty-eight".