1210200121020 has 96 divisors (see below), whose sum is σ = 3698448074496. Its totient is φ = 293236070400.

The previous prime is 1210200121007. The next prime is 1210200121027. The reversal of 1210200121020 is 201210020121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1210200120987 and 1210200121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210200121027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 876675 + ... + 1785765.

It is an arithmetic number, because the mean of its divisors is an integer number (38525500776).

Almost surely, 2^{1210200121020} is an apocalyptic number.

1210200121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1210200121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1849224037248).

1210200121020 is an abundant number, since it is smaller than the sum of its proper divisors (2488247953476).

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

1210200121020 is a wasteful number, since it uses less digits than its factorization.

1210200121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911131 (or 911129 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1210200121020 its reverse (201210020121), we get a palindrome (1411410141141).

The spelling of 1210200121020 in words is "one trillion, two hundred ten billion, two hundred million, one hundred twenty-one thousand, twenty".