21454413 has 8 divisors (see below), whose sum is σ = 29379168. Its totient is φ = 13916304.

The previous prime is 21454409. The next prime is 21454441. The reversal of 21454413 is 31445412.

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

It is not a de Polignac number, because 21454413 - 2² = 21454409 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21454483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96531 + ... + 96752.

It is an arithmetic number, because the mean of its divisors is an integer number (3672396).

Almost surely, 2^21454413 is an apocalyptic number.

It is an amenable number.

21454413 is a deficient number, since it is larger than the sum of its proper divisors (7924755).

21454413 is a wasteful number, since it uses less digits than its factorization.

21454413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193323.

The product of its digits is 1920, while the sum is 24.

The square root of 21454413 is about 4631.8908665900. The cubic root of 21454413 is about 277.8682198948.

Adding to 21454413 its reverse (31445412), we get a palindrome (52899825).

Subtracting 21454413 from its reverse (31445412), we obtain a palindrome (9990999).

The spelling of 21454413 in words is "twenty-one million, four hundred fifty-four thousand, four hundred thirteen".