12101021020 has 24 divisors (see below), whose sum is σ = 27722339568. Its totient is φ = 4400371200.

The previous prime is 12101020949. The next prime is 12101021041. The reversal of 12101021020 is 2012010121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 12101020988 and 12101021006.

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, 27502101 + ... + 27502540.

It is an arithmetic number, because the mean of its divisors is an integer number (1155097482).

Almost surely, 2^12101021020 is an apocalyptic number.

12101021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12101021020 is an abundant number, since it is smaller than the sum of its proper divisors (15621318548).

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

12101021020 is a wasteful number, since it uses less digits than its factorization.

12101021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55004661 (or 55004659 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 12101021020 its reverse (2012010121), we get a palindrome (14113031141).

The spelling of 12101021020 in words is "twelve billion, one hundred one million, twenty-one thousand, twenty".