21054453 has 16 divisors (see below), whose sum is σ = 33478656. Its totient is φ = 11507760.

The previous prime is 21054437. The next prime is 21054457. The reversal of 21054453 is 35445012.

It is not a de Polignac number, because 21054453 - 2⁴ = 21054437 is a prime.

It is a super-2 number, since 2×21054453² = 886579982258418, which contains 22 as substring.

It is a Curzon number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21313 + ... + 22278.

It is an arithmetic number, because the mean of its divisors is an integer number (2092416).

Almost surely, 2^21054453 is an apocalyptic number.

21054453 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21054453 is a deficient number, since it is larger than the sum of its proper divisors (12424203).

21054453 is a wasteful number, since it uses less digits than its factorization.

21054453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43624.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 21054453 is about 4588.5131578759. The cubic root of 21054453 is about 276.1306748360.

Adding to 21054453 its reverse (35445012), we get a palindrome (56499465).

The spelling of 21054453 in words is "twenty-one million, fifty-four thousand, four hundred fifty-three".