101021000000000 has 200 divisors, whose sum is σ = 252308338421436. Its totient is φ = 40408000000000.

The previous prime is 101020999999999. The next prime is 101021000000003. The reversal of 101021000000000 is 120101.

It is a happy number.

It can be written as a sum of positive squares in 10 ways, for example, as 30924454072576 + 70096545927424 = 5560976^2 + 8372368^2 .

It is a tau number, because it is divible by the number of its divisors (200).

It is a Harshad number since it is a multiple of its sum of digits (5).

It is not an unprimeable number, because it can be changed into a prime (101021000000003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 999949490 + ... + 1000050510.

Almost surely, 2^{101021000000000} is an apocalyptic number.

101021000000000 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 101021000000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126154169210718).

101021000000000 is an abundant number, since it is smaller than the sum of its proper divisors (151287338421436).

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

101021000000000 is an frugal number, since it uses more digits than its factorization.

101021000000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101084 (or 101028 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 5.

Adding to 101021000000000 its reverse (120101), we get a palindrome (101021000120101).

The spelling of 101021000000000 in words is "one hundred one trillion, twenty-one billion", and thus it is an aban number.