120120021000 has 288 divisors, whose sum is σ = 472294045080. Its totient is φ = 27455904000.

The previous prime is 120120020953. The next prime is 120120021031. The reversal of 120120021000 is 120021021.

It can be written as a sum of positive squares in 4 ways, for example, as 27425347236 + 92694673764 = 165606^2 + 304458^2 .

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

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

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, 304810 + ... + 577190.

Almost surely, 2^120120021000 is an apocalyptic number.

120120021000 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 120120021000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236147022540).

120120021000 is an abundant number, since it is smaller than the sum of its proper divisors (352174024080).

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

120120021000 is a wasteful number, since it uses less digits than its factorization.

120120021000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272422 (or 272398 counting only the distinct ones).

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

Adding to 120120021000 its reverse (120021021), we get a palindrome (120240042021).

The spelling of 120120021000 in words is "one hundred twenty billion, one hundred twenty million, twenty-one thousand".