21083492 has 6 divisors (see below), whose sum is σ = 36896118. Its totient is φ = 10541744.

The previous prime is 21083449. The next prime is 21083537. The reversal of 21083492 is 29438012.

It can be written as a sum of positive squares in only one way, i.e., 11999296 + 9084196 = 3464^2 + 3014^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2635433 + ... + 2635440.

It is an arithmetic number, because the mean of its divisors is an integer number (6149353).

Almost surely, 2^21083492 is an apocalyptic number.

It is an amenable number.

21083492 is a deficient number, since it is larger than the sum of its proper divisors (15812626).

21083492 is a wasteful number, since it uses less digits than its factorization.

21083492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5270877 (or 5270875 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 21083492 is about 4591.6763823249. The cubic root of 21083492 is about 276.2575660452.

The spelling of 21083492 in words is "twenty-one million, eighty-three thousand, four hundred ninety-two".