21164773 has 8 divisors (see below), whose sum is σ = 24216192. Its totient is φ = 18120336.

The previous prime is 21164771. The next prime is 21164789. The reversal of 21164773 is 37746112.

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 21164773 - 2¹ = 21164771 is a prime.

It is a super-2 number, since 2×21164773² = 895895232283058, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21164771) 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, 10536 + ... + 12382.

It is an arithmetic number, because the mean of its divisors is an integer number (3027024).

Almost surely, 2^21164773 is an apocalyptic number.

It is an amenable number.

21164773 is a deficient number, since it is larger than the sum of its proper divisors (3051419).

21164773 is a wasteful number, since it uses less digits than its factorization.

21164773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3491.

The product of its digits is 7056, while the sum is 31.

The square root of 21164773 is about 4600.5187750948. The cubic root of 21164773 is about 276.6121198572.

It can be divided in two parts, 2116 and 4773, that added together give a square (6889 = 83²).

The spelling of 21164773 in words is "twenty-one million, one hundred sixty-four thousand, seven hundred seventy-three".