1221000122652 has 12 divisors (see below), whose sum is σ = 2849000286216. Its totient is φ = 407000040880.

The previous prime is 1221000122651. The next prime is 1221000122701. The reversal of 1221000122652 is 2562210001221.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221000122651) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 50875005099 + ... + 50875005122.

It is an arithmetic number, because the mean of its divisors is an integer number (237416690518).

Almost surely, 2^{1221000122652} is an apocalyptic number.

1221000122652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221000122652 is an abundant number, since it is smaller than the sum of its proper divisors (1628000163564).

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

1221000122652 is a wasteful number, since it uses less digits than its factorization.

1221000122652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101750010228 (or 101750010226 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 1221000122652 its reverse (2562210001221), we get a palindrome (3783210123873).

The spelling of 1221000122652 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two thousand, six hundred fifty-two".