21082930 has 32 divisors (see below), whose sum is σ = 41731200. Its totient is φ = 7605120.

The previous prime is 21082903. The next prime is 21082939. The reversal of 21082930 is 3928012.

It is a junction number, because it is equal to n+sod(n) for n = 21082895 and 21082904.

It is not an unprimeable number, because it can be changed into a prime (21082939) 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, 14371 + ... + 15769.

It is an arithmetic number, because the mean of its divisors is an integer number (1304100).

Almost surely, 2^21082930 is an apocalyptic number.

21082930 is a deficient number, since it is larger than the sum of its proper divisors (20648270).

21082930 is a wasteful number, since it uses less digits than its factorization.

21082930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1554.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 21082930 is about 4591.6151842244. The cubic root of 21082930 is about 276.2551113896.

The spelling of 21082930 in words is "twenty-one million, eighty-two thousand, nine hundred thirty".