12201021020 has 12 divisors (see below), whose sum is σ = 25622144184. Its totient is φ = 4880408400.

The previous prime is 12201021011. The next prime is 12201021031. The reversal of 12201021020 is 2012010221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12201020992 and 12201021010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305025506 + ... + 305025545.

It is an arithmetic number, because the mean of its divisors is an integer number (2135178682).

Almost surely, 2^12201021020 is an apocalyptic number.

12201021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12201021020 is an abundant number, since it is smaller than the sum of its proper divisors (13421123164).

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

12201021020 is a wasteful number, since it uses less digits than its factorization.

12201021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610051060 (or 610051058 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12201021020 its reverse (2012010221), we get a palindrome (14213031241).

The spelling of 12201021020 in words is "twelve billion, two hundred one million, twenty-one thousand, twenty".