1210121021200 has 120 divisors (see below), whose sum is σ = 3578234881088. Its totient is φ = 382983344640.

The previous prime is 1210121021191. The next prime is 1210121021201. The reversal of 1210121021200 is 21201210121.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (1210121021201) 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 23 ways as a sum of consecutive naturals, for example, 16586142 + ... + 16658941.

Almost surely, 2^{1210121021200} is an apocalyptic number.

1210121021200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210121021200 is an abundant number, since it is smaller than the sum of its proper divisors (2368113859888).

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

1210121021200 is a wasteful number, since it uses less digits than its factorization.

1210121021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33245121 (or 33245110 counting only the distinct ones).

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

Adding to 1210121021200 its reverse (21201210121), we get a palindrome (1231322231321).

The spelling of 1210121021200 in words is "one trillion, two hundred ten billion, one hundred twenty-one million, twenty-one thousand, two hundred".