21796851 has 8 divisors (see below), whose sum is σ = 29460880. Its totient is φ = 14332032.

The previous prime is 21796843. The next prime is 21796867. The reversal of 21796851 is 15869712.

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

It is not a de Polignac number, because 21796851 - 2³ = 21796843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21796891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49546 + ... + 49983.

It is an arithmetic number, because the mean of its divisors is an integer number (3682610).

Almost surely, 2^21796851 is an apocalyptic number.

21796851 is a deficient number, since it is larger than the sum of its proper divisors (7664029).

21796851 is an equidigital number, since it uses as much as digits as its factorization.

21796851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99605.

The product of its digits is 30240, while the sum is 39.

The square root of 21796851 is about 4668.7097789432. The cubic root of 21796851 is about 279.3387927092.

The spelling of 21796851 in words is "twenty-one million, seven hundred ninety-six thousand, eight hundred fifty-one".