21197000 has 128 divisors (see below), whose sum is σ = 56609280. Its totient is φ = 7360000.

The previous prime is 21196949. The next prime is 21197017. The reversal of 21197000 is 79112.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 450977 + ... + 451023.

It is an arithmetic number, because the mean of its divisors is an integer number (442260).

Almost surely, 2^21197000 is an apocalyptic number.

21197000 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 21197000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28304640).

21197000 is an abundant number, since it is smaller than the sum of its proper divisors (35412280).

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

21197000 is a wasteful number, since it uses less digits than its factorization.

21197000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 21197000 is about 4604.0199825804. The cubic root of 21197000 is about 276.7524451366.

It can be divided in two parts, 2119 and 7000, that added together give a palindrome (9119).

The spelling of 21197000 in words is "twenty-one million, one hundred ninety-seven thousand".