1211222200121 has 8 divisors (see below), whose sum is σ = 1313750335464. Its totient is φ = 1112169594880.

The previous prime is 1211222200117. The next prime is 1211222200141. The reversal of 1211222200121 is 1210022221121.

It can be written as a sum of positive squares in 4 ways, for example, as 250800640000 + 960421560121 = 500800^2 + 980011^2 .

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

It is not a de Polignac number, because 1211222200121 - 2² = 1211222200117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211222200121.

It is not an unprimeable number, because it can be changed into a prime (1211222200141) 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 7 ways as a sum of consecutive naturals, for example, 868881800 + ... + 868883193.

It is an arithmetic number, because the mean of its divisors is an integer number (164218791933).

Almost surely, 2^{1211222200121} is an apocalyptic number.

It is an amenable number.

1211222200121 is a deficient number, since it is larger than the sum of its proper divisors (102528135343).

1211222200121 is a wasteful number, since it uses less digits than its factorization.

1211222200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737765051.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1211222200121 its reverse (1210022221121), we get a palindrome (2421244421242).

The spelling of 1211222200121 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, two hundred thousand, one hundred twenty-one".