21797160 has 192 divisors, whose sum is σ = 83229120. Its totient is φ = 4515840.

The previous prime is 21797159. The next prime is 21797189. The reversal of 21797160 is 6179712.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64512 + ... + 64848.

It is an arithmetic number, because the mean of its divisors is an integer number (433485).

Almost surely, 2^21797160 is an apocalyptic number.

21797160 is a gapful number since it is divisible by the number (20) 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 21797160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41614560).

21797160 is an abundant number, since it is smaller than the sum of its proper divisors (61431960).

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

21797160 is a wasteful number, since it uses less digits than its factorization.

21797160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 365 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 33.

The square root of 21797160 is about 4668.7428714805. The cubic root of 21797160 is about 279.3401127054.

It can be divided in two parts, 2179 and 7160, that added together give a palindrome (9339).

The spelling of 21797160 in words is "twenty-one million, seven hundred ninety-seven thousand, one hundred sixty".