1021000120000 has 280 divisors, whose sum is σ = 2896704757760. Its totient is φ = 349660800000.

The previous prime is 1021000119983. The next prime is 1021000120003. The reversal of 1021000120000 is 210001201.

It is a tau number, because it is divible by the number of its divisors (280).

It is a Harshad number since it is a multiple of its sum of digits (7).

It is not an unprimeable number, because it can be changed into a prime (1021000120003) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 358118575 + ... + 358121425.

Almost surely, 2^{1021000120000} is an apocalyptic number.

1021000120000 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 1021000120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1448352378880).

1021000120000 is an abundant number, since it is smaller than the sum of its proper divisors (1875704637760).

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

1021000120000 is an equidigital number, since it uses as much as digits as its factorization.

1021000120000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4169 (or 4144 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 1021000120000 its reverse (210001201), we get a palindrome (1021210121201).

The spelling of 1021000120000 in words is "one trillion, twenty-one billion, one hundred twenty thousand".