11212120121000 has 64 divisors (see below), whose sum is σ = 26237870202960. Its totient is φ = 4484590080000.

The previous prime is 11212120120969. The next prime is 11212120121009. The reversal of 11212120121000 is 12102121211.

It can be written as a sum of positive squares in 8 ways, for example, as 1516232673316 + 9695887447684 = 1231354^2 + 3113822^2 .

It is not an unprimeable number, because it can be changed into a prime (11212120121009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17567480 + ... + 18194520.

Almost surely, 2^{11212120121000} is an apocalyptic number.

11212120121000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11212120121000 is an abundant number, since it is smaller than the sum of its proper divisors (15025750081960).

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

11212120121000 is a wasteful number, since it uses less digits than its factorization.

11212120121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644943 (or 644929 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 11212120121000 its reverse (12102121211), we get a palindrome (11224222242211).

The spelling of 11212120121000 in words is "eleven trillion, two hundred twelve billion, one hundred twenty million, one hundred twenty-one thousand".