21827120 has 40 divisors (see below), whose sum is σ = 57999264. Its totient is φ = 7483392.

The previous prime is 21827119. The next prime is 21827123. The reversal of 21827120 is 2172812.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (21827123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18929 + ... + 20048.

Almost surely, 2^21827120 is an apocalyptic number.

21827120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21827120 is an abundant number, since it is smaller than the sum of its proper divisors (36172144).

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

21827120 is a wasteful number, since it uses less digits than its factorization.

21827120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38997 (or 38991 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 21827120 is about 4671.9503422019. The cubic root of 21827120 is about 279.4680376020.

Adding to 21827120 its reverse (2172812), we get a palindrome (23999932).

The spelling of 21827120 in words is "twenty-one million, eight hundred twenty-seven thousand, one hundred twenty".