21675351 has 8 divisors (see below), whose sum is σ = 28938880. Its totient is φ = 14431032.

The previous prime is 21675337. The next prime is 21675359. The reversal of 21675351 is 15357612.

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

It is not a de Polignac number, because 21675351 - 2⁶ = 21675287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21675359) 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, 1921 + ... + 6858.

It is an arithmetic number, because the mean of its divisors is an integer number (3617360).

Almost surely, 2^21675351 is an apocalyptic number.

21675351 is a deficient number, since it is larger than the sum of its proper divisors (7263529).

21675351 is an equidigital number, since it uses as much as digits as its factorization.

21675351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9605.

The product of its digits is 6300, while the sum is 30.

The square root of 21675351 is about 4655.6794348408. The cubic root of 21675351 is about 278.8187952489.

The spelling of 21675351 in words is "twenty-one million, six hundred seventy-five thousand, three hundred fifty-one".