21200454 has 40 divisors (see below), whose sum is σ = 51827688. Its totient is φ = 6423840.

The previous prime is 21200401. The next prime is 21200461. The reversal of 21200454 is 45400212.

21200454 is a `hidden beast` number, since 212 + 0 + 0 + 454 = 666.

It is a super-2 number, since 2×21200454² = 898918499612232, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 4167 + ... + 7730.

Almost surely, 2^21200454 is an apocalyptic number.

21200454 is an abundant number, since it is smaller than the sum of its proper divisors (30627234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21200454 is a wasteful number, since it uses less digits than its factorization.

21200454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11922 (or 11913 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 21200454 is about 4604.3950742741. The cubic root of 21200454 is about 276.7674763679.

Adding to 21200454 its reverse (45400212), we get a palindrome (66600666).

The spelling of 21200454 in words is "twenty-one million, two hundred thousand, four hundred fifty-four".