21164467 has 8 divisors (see below), whose sum is σ = 21492000. Its totient is φ = 20839104.

The previous prime is 21164459. The next prime is 21164477. The reversal of 21164467 is 76446112.

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 21164467 - 2³ = 21164459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21164447) 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, 35034 + ... + 35632.

It is an arithmetic number, because the mean of its divisors is an integer number (2686500).

Almost surely, 2^21164467 is an apocalyptic number.

21164467 is a deficient number, since it is larger than the sum of its proper divisors (327533).

21164467 is an equidigital number, since it uses as much as digits as its factorization.

21164467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085.

The product of its digits is 8064, while the sum is 31.

The square root of 21164467 is about 4600.4855178557. The cubic root of 21164467 is about 276.6107867660.

The spelling of 21164467 in words is "twenty-one million, one hundred sixty-four thousand, four hundred sixty-seven".