121211666650 has 24 divisors (see below), whose sum is σ = 225479345184. Its totient is φ = 48479151600.

The previous prime is 121211666623. The next prime is 121211666669. The reversal of 121211666650 is 56666112121.

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 11 ways as a sum of consecutive naturals, for example, 321219 + ... + 587881.

It is an arithmetic number, because the mean of its divisors is an integer number (9394972716).

Almost surely, 2^121211666650 is an apocalyptic number.

121211666650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121211666650 is a deficient number, since it is larger than the sum of its proper divisors (104267678534).

121211666650 is a wasteful number, since it uses less digits than its factorization.

121211666650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275766 (or 275761 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

Adding to 121211666650 its reverse (56666112121), we get a palindrome (177877778771).

The spelling of 121211666650 in words is "one hundred twenty-one billion, two hundred eleven million, six hundred sixty-six thousand, six hundred fifty".