1002012120 has 320 divisors, whose sum is σ = 3640744800. Its totient is φ = 246343680.

The previous prime is 1002012071. The next prime is 1002012131. The reversal of 1002012120 is 212102001.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2523762 + ... + 2524158.

Almost surely, 2^1002012120 is an apocalyptic number.

1002012120 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 1002012120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1820372400).

1002012120 is an abundant number, since it is smaller than the sum of its proper divisors (2638732680).

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

1002012120 is a wasteful number, since it uses less digits than its factorization.

1002012120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480 (or 467 counting only the distinct ones).

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

The square root of 1002012120 is about 31654.5750247891. The cubic root of 1002012120 is about 1000.6702573214.

Adding to 1002012120 its reverse (212102001), we get a palindrome (1214114121).

The spelling of 1002012120 in words is "one billion, two million, twelve thousand, one hundred twenty".