21321662 has 8 divisors (see below), whose sum is σ = 32027016. Its totient is φ = 10645992.

The previous prime is 21321661. The next prime is 21321683. The reversal of 21321662 is 26612312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21321662² = 909226540884488, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5528 + ... + 8555.

It is an arithmetic number, because the mean of its divisors is an integer number (4003377).

Almost surely, 2^21321662 is an apocalyptic number.

21321662 is a deficient number, since it is larger than the sum of its proper divisors (10705354).

21321662 is a wasteful number, since it uses less digits than its factorization.

21321662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14842.

The product of its digits is 864, while the sum is 23.

The square root of 21321662 is about 4617.5385217668. The cubic root of 21321662 is about 277.2939226979.

Adding to 21321662 its reverse (26612312), we get a palindrome (47933974).

The spelling of 21321662 in words is "twenty-one million, three hundred twenty-one thousand, six hundred sixty-two".