121221005 has 8 divisors (see below), whose sum is σ = 150157824. Its totient is φ = 93848400.

The previous prime is 121220993. The next prime is 121221013. The reversal of 121221005 is 500122121.

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

It is not a de Polignac number, because 121221005 - 2⁶ = 121220941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390881 + ... + 391190.

It is an arithmetic number, because the mean of its divisors is an integer number (18769728).

Almost surely, 2^121221005 is an apocalyptic number.

It is an amenable number.

121221005 is a deficient number, since it is larger than the sum of its proper divisors (28936819).

121221005 is an equidigital number, since it uses as much as digits as its factorization.

121221005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782107.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 121221005 is about 11010.0410989242. The cubic root of 121221005 is about 494.9096934192.

Adding to 121221005 its reverse (500122121), we get a palindrome (621343126).

The spelling of 121221005 in words is "one hundred twenty-one million, two hundred twenty-one thousand, five".