1021020001200 has 360 divisors, whose sum is σ = 3867852788800. Its totient is φ = 257941428480.

The previous prime is 1021020001193. The next prime is 1021020001229. The reversal of 1021020001200 is 21000201201.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1570371 + ... + 2123229.

Almost surely, 2^{1021020001200} is an apocalyptic number.

1021020001200 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 1021020001200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1933926394400).

1021020001200 is an abundant number, since it is smaller than the sum of its proper divisors (2846832787600).

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

1021020001200 is a wasteful number, since it uses less digits than its factorization.

1021020001200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552911 (or 552888 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1021020001200 its reverse (21000201201), we get a palindrome (1042020202401).

The spelling of 1021020001200 in words is "one trillion, twenty-one billion, twenty million, one thousand, two hundred".