21974206 has 8 divisors (see below), whose sum is σ = 33253344. Its totient is φ = 10889760.

The previous prime is 21974201. The next prime is 21974243. The reversal of 21974206 is 60247912.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21974201) 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, 48390 + ... + 48841.

It is an arithmetic number, because the mean of its divisors is an integer number (4156668).

Almost surely, 2^21974206 is an apocalyptic number.

21974206 is a deficient number, since it is larger than the sum of its proper divisors (11279138).

21974206 is a wasteful number, since it uses less digits than its factorization.

21974206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97346.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 21974206 is about 4687.6653037520. The cubic root of 21974206 is about 280.0943814480.

The spelling of 21974206 in words is "twenty-one million, nine hundred seventy-four thousand, two hundred six".