21840192 has 140 divisors (see below), whose sum is σ = 70811136. Its totient is φ = 6600960.

The previous prime is 21840157. The next prime is 21840193. The reversal of 21840192 is 29104812.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21840193) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 56833 + ... + 57215.

Almost surely, 2^21840192 is an apocalyptic number.

21840192 is a gapful number since it is divisible by the number (22) 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 21840192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35405568).

21840192 is an abundant number, since it is smaller than the sum of its proper divisors (48970944).

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

21840192 is a wasteful number, since it uses less digits than its factorization.

21840192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418 (or 399 counting only the distinct ones).

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

The square root of 21840192 is about 4673.3491202777. The cubic root of 21840192 is about 279.5238164853.

The spelling of 21840192 in words is "twenty-one million, eight hundred forty thousand, one hundred ninety-two".