21197082 has 32 divisors (see below), whose sum is σ = 43747200. Its totient is φ = 6842880.

The previous prime is 21197081. The next prime is 21197089. The reversal of 21197082 is 28079112.

It is not an unprimeable number, because it can be changed into a prime (21197081) 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 15 ways as a sum of consecutive naturals, for example, 48738 + ... + 49170.

It is an arithmetic number, because the mean of its divisors is an integer number (1367100).

Almost surely, 2^21197082 is an apocalyptic number.

21197082 is an abundant number, since it is smaller than the sum of its proper divisors (22550118).

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

21197082 is a wasteful number, since it uses less digits than its factorization.

21197082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 21197082 is about 4604.0288878329. The cubic root of 21197082 is about 276.7528020058.

The spelling of 21197082 in words is "twenty-one million, one hundred ninety-seven thousand, eighty-two".