21408192 has 112 divisors (see below), whose sum is σ = 67848480. Its totient is φ = 6580224.

The previous prime is 21408181. The next prime is 21408227. The reversal of 21408192 is 29180412.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21988 + ... + 22940.

It is an arithmetic number, because the mean of its divisors is an integer number (605790).

Almost surely, 2^21408192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21408192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33924240).

21408192 is an abundant number, since it is smaller than the sum of its proper divisors (46440288).

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

21408192 is a wasteful number, since it uses less digits than its factorization.

21408192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987 (or 971 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 21408192 is about 4626.8987453801. The cubic root of 21408192 is about 277.6685316659.

The spelling of 21408192 in words is "twenty-one million, four hundred eight thousand, one hundred ninety-two".