1000020111012 has 72 divisors (see below), whose sum is σ = 2723330937600. Its totient is φ = 307579366080.

The previous prime is 1000020111011. The next prime is 1000020111019. The reversal of 1000020111012 is 2101110200001.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 1000020110985 and 1000020111003.

It is not an unprimeable number, because it can be changed into a prime (1000020111011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 800239 + ... + 1624937.

It is an arithmetic number, because the mean of its divisors is an integer number (37824040800).

Almost surely, 2^{1000020111012} is an apocalyptic number.

1000020111012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1000020111012 is an abundant number, since it is smaller than the sum of its proper divisors (1723310826588).

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

1000020111012 is a wasteful number, since it uses less digits than its factorization.

1000020111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827313 (or 827308 counting only the distinct ones).

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

Adding to 1000020111012 its reverse (2101110200001), we get a palindrome (3101130311013).

The spelling of 1000020111012 in words is "one trillion, twenty million, one hundred eleven thousand, twelve".