21454323 has 32 divisors (see below), whose sum is σ = 33384960. Its totient is φ = 12111360.

The previous prime is 21454297. The next prime is 21454333. The reversal of 21454323 is 32345412.

21454323 = 977² + 978² + ... + 998².

It is not a de Polignac number, because 21454323 - 2¹⁴ = 21437939 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21454293 and 21454302.

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 31 ways as a sum of consecutive naturals, for example, 93573 + ... + 93801.

It is an arithmetic number, because the mean of its divisors is an integer number (1043280).

Almost surely, 2^21454323 is an apocalyptic number.

21454323 is a deficient number, since it is larger than the sum of its proper divisors (11930637).

21454323 is a wasteful number, since it uses less digits than its factorization.

21454323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427.

The product of its digits is 2880, while the sum is 24.

The square root of 21454323 is about 4631.8811513250. The cubic root of 21454323 is about 277.8678313473.

Adding to 21454323 its reverse (32345412), we get a palindrome (53799735).

The spelling of 21454323 in words is "twenty-one million, four hundred fifty-four thousand, three hundred twenty-three".