21454168 has 16 divisors (see below), whose sum is σ = 40295160. Its totient is φ = 10708800.

The previous prime is 21454163. The next prime is 21454217. The reversal of 21454168 is 86145412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21454163) 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 3 ways as a sum of consecutive naturals, for example, 3588 + ... + 7468.

Almost surely, 2^21454168 is an apocalyptic number.

It is an amenable number.

21454168 is a deficient number, since it is larger than the sum of its proper divisors (18840992).

21454168 is a wasteful number, since it uses less digits than its factorization.

21454168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4578 (or 4574 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 21454168 is about 4631.8644194320. The cubic root of 21454168 is about 277.8671621796.

It can be divided in two parts, 21 and 454168, that multiplied together give a triangular number (9537528 = T₄₃₆₇).

The spelling of 21454168 in words is "twenty-one million, four hundred fifty-four thousand, one hundred sixty-eight".