21097082 has 16 divisors (see below), whose sum is σ = 32431104. Its totient is φ = 10290000.

The previous prime is 21097057. The next prime is 21097091. The reversal of 21097082 is 28079012.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13607 + ... + 15077.

It is an arithmetic number, because the mean of its divisors is an integer number (2026944).

Almost surely, 2^21097082 is an apocalyptic number.

21097082 is a deficient number, since it is larger than the sum of its proper divisors (11334022).

21097082 is a wasteful number, since it uses less digits than its factorization.

21097082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1645.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 21097082 is about 4593.1559956091. The cubic root of 21097082 is about 276.3169100089.

The spelling of 21097082 in words is "twenty-one million, ninety-seven thousand, eighty-two".