21927361 has 8 divisors (see below), whose sum is σ = 22239360. Its totient is φ = 21617472.

The previous prime is 21927341. The next prime is 21927371. The reversal of 21927361 is 16372912.

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

It is a cyclic number.

It is not a de Polignac number, because 21927361 - 2⁵ = 21927329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21927341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36681 + ... + 37273.

It is an arithmetic number, because the mean of its divisors is an integer number (2779920).

Almost surely, 2^21927361 is an apocalyptic number.

It is an amenable number.

21927361 is a deficient number, since it is larger than the sum of its proper divisors (311999).

21927361 is a wasteful number, since it uses less digits than its factorization.

21927361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055.

The product of its digits is 4536, while the sum is 31.

The square root of 21927361 is about 4682.6660141419. Note that the first 3 decimals coincide. The cubic root of 21927361 is about 279.8952031290.

The spelling of 21927361 in words is "twenty-one million, nine hundred twenty-seven thousand, three hundred sixty-one".