21927814 has 4 divisors (see below), whose sum is σ = 32891724. Its totient is φ = 10963906.

The previous prime is 21927811. The next prime is 21927817. The reversal of 21927814 is 41872912.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21927811) and next prime (21927817).

It is a self number, because there is not a number n which added to its sum of digits gives 21927814.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21927811) 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 as a sum of consecutive naturals, namely, 5481952 + ... + 5481955.

It is an arithmetic number, because the mean of its divisors is an integer number (8222931).

Almost surely, 2^21927814 is an apocalyptic number.

21927814 is a deficient number, since it is larger than the sum of its proper divisors (10963910).

21927814 is a wasteful number, since it uses less digits than its factorization.

21927814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10963909.

The product of its digits is 8064, while the sum is 34.

The square root of 21927814 is about 4682.7143837736. The cubic root of 21927814 is about 279.8971305787.

The spelling of 21927814 in words is "twenty-one million, nine hundred twenty-seven thousand, eight hundred fourteen".