1211001022120 has 16 divisors (see below), whose sum is σ = 2724752299860. Its totient is φ = 484400408832.

The previous prime is 1211001022109. The next prime is 1211001022123. The reversal of 1211001022120 is 212201001121.

It can be written as a sum of positive squares in 2 ways, for example, as 1131198162084 + 79802860036 = 1063578^2 + 282494^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1211001022120.

It is not an unprimeable number, because it can be changed into a prime (1211001022123) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 15137512737 + ... + 15137512816.

Almost surely, 2^{1211001022120} is an apocalyptic number.

1211001022120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211001022120 is an abundant number, since it is smaller than the sum of its proper divisors (1513751277740).

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

1211001022120 is a wasteful number, since it uses less digits than its factorization.

1211001022120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30275025564 (or 30275025560 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1211001022120 its reverse (212201001121), we get a palindrome (1423202023241).

The spelling of 1211001022120 in words is "one trillion, two hundred eleven billion, one million, twenty-two thousand, one hundred twenty".