21454330 has 8 divisors (see below), whose sum is σ = 38617812. Its totient is φ = 8581728.

The previous prime is 21454297. The next prime is 21454333. The reversal of 21454330 is 3345412.

It can be written as a sum of positive squares in 2 ways, for example, as 21316689 + 137641 = 4617^2 + 371^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21454333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1072707 + ... + 1072726.

Almost surely, 2^21454330 is an apocalyptic number.

21454330 is a deficient number, since it is larger than the sum of its proper divisors (17163482).

21454330 is a wasteful number, since it uses less digits than its factorization.

21454330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145440.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 21454330 is about 4631.8819069575. The cubic root of 21454330 is about 277.8678615677.

Adding to 21454330 its reverse (3345412), we get a palindrome (24799742).

The spelling of 21454330 in words is "twenty-one million, four hundred fifty-four thousand, three hundred thirty".