21082699 has 8 divisors (see below), whose sum is σ = 23128560. Its totient is φ = 19058400.

The previous prime is 21082687. The next prime is 21082729. The reversal of 21082699 is 99628012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21082699 - 2⁵ = 21082667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21082199) 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 7 ways as a sum of consecutive naturals, for example, 3304 + ... + 7285.

It is an arithmetic number, because the mean of its divisors is an integer number (2891070).

Almost surely, 2^21082699 is an apocalyptic number.

21082699 is a deficient number, since it is larger than the sum of its proper divisors (2045861).

21082699 is a wasteful number, since it uses less digits than its factorization.

21082699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10781.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 21082699 is about 4591.5900296085. The cubic root of 21082699 is about 276.2541024349.

It can be divided in two parts, 210826 and 99, that added together give a triangular number (210925 = T₆₄₉).

The spelling of 21082699 in words is "twenty-one million, eighty-two thousand, six hundred ninety-nine".