121620205 has 48 divisors (see below), whose sum is σ = 179656704. Its totient is φ = 78650880.

The previous prime is 121620167. The next prime is 121620217. The reversal of 121620205 is 502026121.

It is not a de Polignac number, because 121620205 - 2¹³ = 121612013 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 (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 636660 + ... + 636850.

It is an arithmetic number, because the mean of its divisors is an integer number (3742848).

Almost surely, 2^121620205 is an apocalyptic number.

It is an amenable number.

121620205 is a deficient number, since it is larger than the sum of its proper divisors (58036499).

121620205 is a wasteful number, since it uses less digits than its factorization.

121620205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 121620205 is about 11028.1551040961. The cubic root of 121620205 is about 495.4523701919.

Adding to 121620205 its reverse (502026121), we get a palindrome (623646326).

The spelling of 121620205 in words is "one hundred twenty-one million, six hundred twenty thousand, two hundred five".