10020111012 has 18 divisors (see below), whose sum is σ = 25328614038. Its totient is φ = 3340036992.

The previous prime is 10020110999. The next prime is 10020111019. The reversal of 10020111012 is 21011102001.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10017207396 + 2903616 = 100086^2 + 1704^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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 = 10020110985 and 10020111003.

It is not an unprimeable number, because it can be changed into a prime (10020111019) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 139168173 + ... + 139168244.

Almost surely, 2^10020111012 is an apocalyptic number.

10020111012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

10020111012 is an abundant number, since it is smaller than the sum of its proper divisors (15308503026).

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

10020111012 is a wasteful number, since it uses less digits than its factorization.

10020111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278336427 (or 278336422 counting only the distinct ones).

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

Adding to 10020111012 its reverse (21011102001), we get a palindrome (31031213013).

The spelling of 10020111012 in words is "ten billion, twenty million, one hundred eleven thousand, twelve".