2001012120 has 64 divisors (see below), whose sum is σ = 6670044000. Its totient is φ = 533602944.

The previous prime is 2001012109. The next prime is 2001012131. The reversal of 2001012120 is 212101002.

It is an interprime number because it is at equal distance from previous prime (2001012109) and next prime (2001012131).

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 15 ways as a sum of consecutive naturals, for example, 925315 + ... + 927474.

Almost surely, 2^2001012120 is an apocalyptic number.

2001012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001012120 is an abundant number, since it is smaller than the sum of its proper divisors (4669031880).

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

2001012120 is a wasteful number, since it uses less digits than its factorization.

2001012120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852809 (or 1852799 counting only the distinct ones).

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

The square root of 2001012120 is about 44732.6739643407. The cubic root of 2001012120 is about 1260.1335459358.

Adding to 2001012120 its reverse (212101002), we get a palindrome (2213113122).

The spelling of 2001012120 in words is "two billion, one million, twelve thousand, one hundred twenty".