21671794 has 8 divisors (see below), whose sum is σ = 33199488. Its totient is φ = 10605300.

The previous prime is 21671791. The next prime is 21671801. The reversal of 21671794 is 49717612.

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

It is not an unprimeable number, because it can be changed into a prime (21671791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115182 + ... + 115369.

It is an arithmetic number, because the mean of its divisors is an integer number (4149936).

Almost surely, 2^21671794 is an apocalyptic number.

21671794 is a deficient number, since it is larger than the sum of its proper divisors (11527694).

21671794 is a wasteful number, since it uses less digits than its factorization.

21671794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230600.

The product of its digits is 21168, while the sum is 37.

The square root of 21671794 is about 4655.2974126257. The cubic root of 21671794 is about 278.8035427053.

It can be divided in two parts, 216717 and 94, that added together give a triangular number (216811 = T₆₅₈).

The spelling of 21671794 in words is "twenty-one million, six hundred seventy-one thousand, seven hundred ninety-four".