21360168 has 24 divisors (see below), whose sum is σ = 57850650. Its totient is φ = 7120032.

The previous prime is 21360149. The next prime is 21360173. The reversal of 21360168 is 86106312.

It can be written as a sum of positive squares in only one way, i.e., 13972644 + 7387524 = 3738^2 + 2718^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 148263 + ... + 148406.

Almost surely, 2^21360168 is an apocalyptic number.

It is an amenable number.

21360168 is an abundant number, since it is smaller than the sum of its proper divisors (36490482).

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

21360168 is a wasteful number, since it uses less digits than its factorization.

21360168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296681 (or 296674 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 21360168 is about 4621.7061784583. The cubic root of 21360168 is about 277.4607492573.

It can be divided in two parts, 21360 and 168, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 21360168 in words is "twenty-one million, three hundred sixty thousand, one hundred sixty-eight".