120021020 has 96 divisors (see below), whose sum is σ = 307722240. Its totient is φ = 38384640.

The previous prime is 120021017. The next prime is 120021023. The reversal of 120021020 is 20120021.

It is an interprime number because it is at equal distance from previous prime (120021017) and next prime (120021023).

It is a junction number, because it is equal to n+sod(n) for n = 120020989 and 120021007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120021023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 502061 + ... + 502299.

It is an arithmetic number, because the mean of its divisors is an integer number (3205440).

Almost surely, 2^120021020 is an apocalyptic number.

120021020 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 120021020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153861120).

120021020 is an abundant number, since it is smaller than the sum of its proper divisors (187701220).

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

120021020 is a wasteful number, since it uses less digits than its factorization.

120021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483 (or 481 counting only the distinct ones).

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

The square root of 120021020 is about 10955.4105354386. The cubic root of 120021020 is about 493.2712130612.

Adding to 120021020 its reverse (20120021), we get a palindrome (140141041).

Subtracting from 120021020 its reverse (20120021), we obtain a palindrome (99900999).

The spelling of 120021020 in words is "one hundred twenty million, twenty-one thousand, twenty".