21320467 has 8 divisors (see below), whose sum is σ = 25152512. Its totient is φ = 17685000.

The previous prime is 21320447. The next prime is 21320479. The reversal of 21320467 is 76402312.

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 21320467 - 2¹⁹ = 20796179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21320407) 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, 48909 + ... + 49342.

It is an arithmetic number, because the mean of its divisors is an integer number (3144064).

Almost surely, 2^21320467 is an apocalyptic number.

21320467 is a deficient number, since it is larger than the sum of its proper divisors (3832045).

21320467 is an equidigital number, since it uses as much as digits as its factorization.

21320467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98289.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 21320467 is about 4617.4091220077. The cubic root of 21320467 is about 277.2887421695.

Adding to 21320467 its reverse (76402312), we get a palindrome (97722779).

The spelling of 21320467 in words is "twenty-one million, three hundred twenty thousand, four hundred sixty-seven".