121668005 has 8 divisors (see below), whose sum is σ = 148002072. Its totient is φ = 96000768.

The previous prime is 121667989. The next prime is 121668011. The reversal of 121668005 is 500866121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9498724 + 112169281 = 3082^2 + 10591^2 .

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 121668005 - 2⁴ = 121667989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166304 + ... + 167033.

It is an arithmetic number, because the mean of its divisors is an integer number (18500259).

Almost surely, 2^121668005 is an apocalyptic number.

It is an amenable number.

121668005 is a deficient number, since it is larger than the sum of its proper divisors (26334067).

121668005 is an equidigital number, since it uses as much as digits as its factorization.

121668005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333415.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 121668005 is about 11030.3220714538. The cubic root of 121668005 is about 495.5172703767.

The spelling of 121668005 in words is "one hundred twenty-one million, six hundred sixty-eight thousand, five".