21955774 has 8 divisors (see below), whose sum is σ = 33136200. Its totient is φ = 10910376.

The previous prime is 21955771. The next prime is 21955783. The reversal of 21955774 is 47755912.

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 (21955771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33349 + ... + 34000.

It is an arithmetic number, because the mean of its divisors is an integer number (4142025).

Almost surely, 2^21955774 is an apocalyptic number.

21955774 is a deficient number, since it is larger than the sum of its proper divisors (11180426).

21955774 is a wasteful number, since it uses less digits than its factorization.

21955774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67514.

The product of its digits is 88200, while the sum is 40.

The square root of 21955774 is about 4685.6988806367. The cubic root of 21955774 is about 280.0160449989.

The spelling of 21955774 in words is "twenty-one million, nine hundred fifty-five thousand, seven hundred seventy-four".