21682051 has 8 divisors (see below), whose sum is σ = 22699008. Its totient is φ = 20685000.

The previous prime is 21682039. The next prime is 21682057. The reversal of 21682051 is 15028612.

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 21682051 - 2⁷ = 21681923 is a prime.

It is a super-2 number, since 2×21682051² = 940222671133202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21682057) by changing a digit.

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, 2725 + ... + 7126.

It is an arithmetic number, because the mean of its divisors is an integer number (2837376).

Almost surely, 2^21682051 is an apocalyptic number.

21682051 is a deficient number, since it is larger than the sum of its proper divisors (1016957).

21682051 is an equidigital number, since it uses as much as digits as its factorization.

21682051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9953.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 21682051 is about 4656.3989305041. The cubic root of 21682051 is about 278.8475205582.

The spelling of 21682051 in words is "twenty-one million, six hundred eighty-two thousand, fifty-one".