1020002120 has 16 divisors (see below), whose sum is σ = 2295004860. Its totient is φ = 408000832.

The previous prime is 1020002111. The next prime is 1020002143. The reversal of 1020002120 is 212000201.

It can be written as a sum of positive squares in 2 ways, for example, as 1019014084 + 988036 = 31922^2 + 994^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a junction number, because it is equal to n+sod(n) for n = 1020002098 and 1020002107.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 12749987 + ... + 12750066.

Almost surely, 2^1020002120 is an apocalyptic number.

1020002120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020002120 is an abundant number, since it is smaller than the sum of its proper divisors (1275002740).

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

1020002120 is a wasteful number, since it uses less digits than its factorization.

1020002120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25500064 (or 25500060 counting only the distinct ones).

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

The square root of 1020002120 is about 31937.4720352128. The cubic root of 1020002120 is about 1006.6234069584.

Adding to 1020002120 its reverse (212000201), we get a palindrome (1232002321).

The spelling of 1020002120 in words is "one billion, twenty million, two thousand, one hundred twenty".