12101011020 has 72 divisors (see below), whose sum is σ = 41950175904. Its totient is φ = 2765945088.

The previous prime is 12101011019. The next prime is 12101011033. The reversal of 12101011020 is 2011010121.

It is a happy number.

It is a super-2 number, since 2×12101011020² (a number of 21 digits) contains 22 as substring.

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 = 12101010993 and 12101011011.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4800729 + ... + 4803248.

It is an arithmetic number, because the mean of its divisors is an integer number (582641332).

Almost surely, 2^12101011020 is an apocalyptic number.

12101011020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12101011020 is an abundant number, since it is smaller than the sum of its proper divisors (29849164884).

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

12101011020 is a wasteful number, since it uses less digits than its factorization.

12101011020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9603999 (or 9603994 counting only the distinct ones).

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

Adding to 12101011020 its reverse (2011010121), we get a palindrome (14112021141).

It can be divided in two parts, 1210101 and 1020, that added together give a palindrome (1211121).

The spelling of 12101011020 in words is "twelve billion, one hundred one million, eleven thousand, twenty".