21454200 has 192 divisors, whose sum is σ = 77004000. Its totient is φ = 5483520.

The previous prime is 21454163. The next prime is 21454217. The reversal of 21454200 is 245412.

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 polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 156532 + ... + 156668.

Almost surely, 2^21454200 is an apocalyptic number.

21454200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21454200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38502000).

21454200 is an abundant number, since it is smaller than the sum of its proper divisors (55549800).

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

21454200 is a wasteful number, since it uses less digits than its factorization.

21454200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 176 counting only the distinct ones).

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

The square root of 21454200 is about 4631.8678737632. The cubic root of 21454200 is about 277.8673003307.

Adding to 21454200 its reverse (245412), we get a palindrome (21699612).

The spelling of 21454200 in words is "twenty-one million, four hundred fifty-four thousand, two hundred".