21927273 has 24 divisors (see below), whose sum is σ = 31741920. Its totient is φ = 13426560.

The previous prime is 21927259. The next prime is 21927281. The reversal of 21927273 is 37272912.

It is not a de Polignac number, because 21927273 - 2¹³ = 21919081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21927233) 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 23 ways as a sum of consecutive naturals, for example, 77893 + ... + 78173.

It is an arithmetic number, because the mean of its divisors is an integer number (1322580).

Almost surely, 2^21927273 is an apocalyptic number.

It is an amenable number.

21927273 is a deficient number, since it is larger than the sum of its proper divisors (9814647).

21927273 is a wasteful number, since it uses less digits than its factorization.

21927273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377 (or 340 counting only the distinct ones).

The product of its digits is 10584, while the sum is 33.

The square root of 21927273 is about 4682.6566177759. The cubic root of 21927273 is about 279.8948286986.

The spelling of 21927273 in words is "twenty-one million, nine hundred twenty-seven thousand, two hundred seventy-three".