1001001012120 has 128 divisors (see below), whose sum is σ = 3451727736000. Its totient is φ = 257728988160.

The previous prime is 1001001012113. The next prime is 1001001012157. The reversal of 1001001012120 is 212101001001.

It is a happy number.

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 31 ways as a sum of consecutive naturals, for example, 15948901 + ... + 16011540.

Almost surely, 2^{1001001012120} is an apocalyptic number.

1001001012120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001001012120 is an abundant number, since it is smaller than the sum of its proper divisors (2450726723880).

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

1001001012120 is a wasteful number, since it uses less digits than its factorization.

1001001012120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31960490 (or 31960480 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1001001012120 its reverse (212101001001), we get a palindrome (1213102013121).

The spelling of 1001001012120 in words is "one trillion, one billion, one million, twelve thousand, one hundred twenty".