120021012100 has 72 divisors (see below), whose sum is σ = 284309928000. Its totient is φ = 43615209600.

The previous prime is 120021012091. The next prime is 120021012101. The reversal of 120021012100 is 1210120021.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (120021012101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1668681 + ... + 1739119.

It is an arithmetic number, because the mean of its divisors is an integer number (3948749000).

Almost surely, 2^120021012100 is an apocalyptic number.

120021012100 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 120021012100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142154964000).

120021012100 is an abundant number, since it is smaller than the sum of its proper divisors (164288915900).

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

120021012100 is a wasteful number, since it uses less digits than its factorization.

120021012100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72013 (or 72006 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 120021012100 its reverse (1210120021), we get a palindrome (121231132121).

The spelling of 120021012100 in words is "one hundred twenty billion, twenty-one million, twelve thousand, one hundred".