12001001020 has 24 divisors (see below), whose sum is σ = 25461921744. Its totient is φ = 4750910976.

The previous prime is 12001001011. The next prime is 12001001053. The reversal of 12001001020 is 2010010021.

It is a junction number, because it is equal to n+sod(n) for n = 12001000994 and 12001001012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3091102 + ... + 3094981.

It is an arithmetic number, because the mean of its divisors is an integer number (1060913406).

Almost surely, 2^12001001020 is an apocalyptic number.

12001001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12001001020 is an abundant number, since it is smaller than the sum of its proper divisors (13460920724).

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

12001001020 is a wasteful number, since it uses less digits than its factorization.

12001001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6186189 (or 6186187 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 12001001020 its reverse (2010010021), we get a palindrome (14011011041).

Subtracting from 12001001020 its reverse (2010010021), we obtain a palindrome (9990990999).

The spelling of 12001001020 in words is "twelve billion, one million, one thousand, twenty".