21197160 has 128 divisors (see below), whose sum is σ = 74448000. Its totient is φ = 5349888.

The previous prime is 21197159. The next prime is 21197161. The reversal of 21197160 is 6179112.

It is an interprime number because it is at equal distance from previous prime (21197159) and next prime (21197161).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (21197161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20004 + ... + 21036.

It is an arithmetic number, because the mean of its divisors is an integer number (581625).

Almost surely, 2^21197160 is an apocalyptic number.

21197160 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 21197160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37224000).

21197160 is an abundant number, since it is smaller than the sum of its proper divisors (53250840).

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

21197160 is a wasteful number, since it uses less digits than its factorization.

21197160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072 (or 1062 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 21197160 is about 4604.0373586668. The cubic root of 21197160 is about 276.7531414659.

The spelling of 21197160 in words is "twenty-one million, one hundred ninety-seven thousand, one hundred sixty".