21197352 has 64 divisors (see below), whose sum is σ = 60341760. Its totient is φ = 6142400.

The previous prime is 21197327. The next prime is 21197353. The reversal of 21197352 is 25379112.

It is not an unprimeable number, because it can be changed into a prime (21197353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4327 + ... + 7817.

It is an arithmetic number, because the mean of its divisors is an integer number (942840).

Almost surely, 2^21197352 is an apocalyptic number.

21197352 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 21197352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30170880).

21197352 is an abundant number, since it is smaller than the sum of its proper divisors (39144408).

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

21197352 is a wasteful number, since it uses less digits than its factorization.

21197352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3534 (or 3530 counting only the distinct ones).

The product of its digits is 3780, while the sum is 30.

The square root of 21197352 is about 4604.0582098840. The cubic root of 21197352 is about 276.7539770565.

The spelling of 21197352 in words is "twenty-one million, one hundred ninety-seven thousand, three hundred fifty-two".