100120021000000 has 392 divisors, whose sum is σ = 267913448945208. Its totient is φ = 36980736000000.

The previous prime is 100120020999997. The next prime is 100120021000019. The reversal of 100120021000000 is 120021001.

It can be written as a sum of positive squares in 28 ways, for example, as 74373651968256 + 25746369031744 = 8624016^2 + 5074088^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 900944440 + ... + 901055560.

Almost surely, 2^{100120021000000} is an apocalyptic number.

100120021000000 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 100120021000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133956724472604).

100120021000000 is an abundant number, since it is smaller than the sum of its proper divisors (167793427945208).

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

100120021000000 is an frugal number, since it uses more digits than its factorization.

100120021000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111233 (or 111198 counting only the distinct ones).

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

Adding to 100120021000000 its reverse (120021001), we get a palindrome (100120141021001).

The spelling of 100120021000000 in words is "one hundred trillion, one hundred twenty billion, twenty-one million", and thus it is an aban number.