121211666652 has 48 divisors (see below), whose sum is σ = 288877276800. Its totient is φ = 39545578560.

The previous prime is 121211666623. The next prime is 121211666669. The reversal of 121211666652 is 256666112121.

It is a self number, because there is not a number n which added to its sum of digits gives 121211666652.

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 15 ways as a sum of consecutive naturals, for example, 211674 + ... + 535937.

It is an arithmetic number, because the mean of its divisors is an integer number (6018276600).

Almost surely, 2^121211666652 is an apocalyptic number.

121211666652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121211666652 is an abundant number, since it is smaller than the sum of its proper divisors (167665610148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121211666652 is a wasteful number, since it uses less digits than its factorization.

121211666652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747906 (or 747904 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

Adding to 121211666652 its reverse (256666112121), we get a palindrome (377877778773).

The spelling of 121211666652 in words is "one hundred twenty-one billion, two hundred eleven million, six hundred sixty-six thousand, six hundred fifty-two".