1021210001200 has 120 divisors (see below), whose sum is σ = 2601439992720. Its totient is φ = 384159744000.

The previous prime is 1021210001179. The next prime is 1021210001263. The reversal of 1021210001200 is 21000121201.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 550800 + ... + 1531600.

It is an arithmetic number, because the mean of its divisors is an integer number (21678666606).

Almost surely, 2^{1021210001200} is an apocalyptic number.

1021210001200 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 1021210001200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1300719996360).

1021210001200 is an abundant number, since it is smaller than the sum of its proper divisors (1580229991520).

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

1021210001200 is a wasteful number, since it uses less digits than its factorization.

1021210001200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980975 (or 980964 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1021210001200 its reverse (21000121201), we get a palindrome (1042210122401).

The spelling of 1021210001200 in words is "one trillion, twenty-one billion, two hundred ten million, one thousand, two hundred".