21927340 has 24 divisors (see below), whose sum is σ = 46136160. Its totient is φ = 8754048.

The previous prime is 21927337. The next prime is 21927341. The reversal of 21927340 is 4372912.

It is a junction number, because it is equal to n+sod(n) for n = 21927299 and 21927308.

It is not an unprimeable number, because it can be changed into a prime (21927341) 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 7 ways as a sum of consecutive naturals, for example, 17784 + ... + 18976.

It is an arithmetic number, because the mean of its divisors is an integer number (1922340).

Almost surely, 2^21927340 is an apocalyptic number.

21927340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21927340 is an abundant number, since it is smaller than the sum of its proper divisors (24208820).

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

21927340 is a wasteful number, since it uses less digits than its factorization.

21927340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121 (or 2119 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 21927340 is about 4682.6637718290. The cubic root of 21927340 is about 279.8951137764.

The spelling of 21927340 in words is "twenty-one million, nine hundred twenty-seven thousand, three hundred forty".