21771473 has 8 divisors (see below), whose sum is σ = 23004000. Its totient is φ = 20547648.

The previous prime is 21771461. The next prime is 21771487. The reversal of 21771473 is 37417712.

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 21771473 - 2¹² = 21767377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21771443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3353 + ... + 7401.

It is an arithmetic number, because the mean of its divisors is an integer number (2875500).

Almost surely, 2^21771473 is an apocalyptic number.

It is an amenable number.

21771473 is a deficient number, since it is larger than the sum of its proper divisors (1232527).

21771473 is a wasteful number, since it uses less digits than its factorization.

21771473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4351.

The product of its digits is 8232, while the sum is 32.

The square root of 21771473 is about 4665.9911058638. The cubic root of 21771473 is about 279.2303395368.

The spelling of 21771473 in words is "twenty-one million, seven hundred seventy-one thousand, four hundred seventy-three".