21956774 has 8 divisors (see below), whose sum is σ = 37640208. Its totient is φ = 9410040.

The previous prime is 21956731. The next prime is 21956777. The reversal of 21956774 is 47765912.

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 (21956777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 784157 + ... + 784184.

It is an arithmetic number, because the mean of its divisors is an integer number (4705026).

Almost surely, 2^21956774 is an apocalyptic number.

21956774 is a deficient number, since it is larger than the sum of its proper divisors (15683434).

21956774 is a wasteful number, since it uses less digits than its factorization.

21956774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568350.

The product of its digits is 105840, while the sum is 41.

The square root of 21956774 is about 4685.8055870896. The cubic root of 21956774 is about 280.0202961478.

The spelling of 21956774 in words is "twenty-one million, nine hundred fifty-six thousand, seven hundred seventy-four".