21453411 has 16 divisors (see below), whose sum is σ = 34113024. Its totient is φ = 11725824.

The previous prime is 21453401. The next prime is 21453427. The reversal of 21453411 is 11435412.

It is not a de Polignac number, because 21453411 - 2⁶ = 21453347 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21453401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21726 + ... + 22691.

It is an arithmetic number, because the mean of its divisors is an integer number (2132064).

Almost surely, 2^21453411 is an apocalyptic number.

21453411 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21453411 is a deficient number, since it is larger than the sum of its proper divisors (12659613).

21453411 is a wasteful number, since it uses less digits than its factorization.

21453411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44450.

The product of its digits is 480, while the sum is 21.

The square root of 21453411 is about 4631.7827021569. The cubic root of 21453411 is about 277.8638940048.

Adding to 21453411 its reverse (11435412), we get a palindrome (32888823).

The spelling of 21453411 in words is "twenty-one million, four hundred fifty-three thousand, four hundred eleven".