21936774 has 8 divisors (see below), whose sum is σ = 43873560. Its totient is φ = 7312256.

The previous prime is 21936767. The next prime is 21936781. The reversal of 21936774 is 47763912.

It is an interprime number because it is at equal distance from previous prime (21936767) and next prime (21936781).

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

21936774 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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, 1828059 + ... + 1828070.

It is an arithmetic number, because the mean of its divisors is an integer number (5484195).

Almost surely, 2^21936774 is an apocalyptic number.

21936774 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21936774 is a wasteful number, since it uses less digits than its factorization.

21936774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3656134.

The product of its digits is 63504, while the sum is 39.

The square root of 21936774 is about 4683.6709961311. The cubic root of 21936774 is about 279.9352486325.

The spelling of 21936774 in words is "twenty-one million, nine hundred thirty-six thousand, seven hundred seventy-four".