21668122 has 8 divisors (see below), whose sum is σ = 37145376. Its totient is φ = 9286332.

The previous prime is 21668111. The next prime is 21668123. The reversal of 21668122 is 22186612.

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

It is a super-2 number, since 2×21668122² = 939015022013768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21668123) 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, 773848 + ... + 773875.

It is an arithmetic number, because the mean of its divisors is an integer number (4643172).

Almost surely, 2^21668122 is an apocalyptic number.

21668122 is a deficient number, since it is larger than the sum of its proper divisors (15477254).

21668122 is a wasteful number, since it uses less digits than its factorization.

21668122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547732.

The product of its digits is 2304, while the sum is 28.

The square root of 21668122 is about 4654.9030065083. The cubic root of 21668122 is about 278.7877952867.

The spelling of 21668122 in words is "twenty-one million, six hundred sixty-eight thousand, one hundred twenty-two".