12211021020 has 48 divisors (see below), whose sum is σ = 37299120768. Its totient is φ = 2960247360.

The previous prime is 12211020971. The next prime is 12211021037. The reversal of 12211021020 is 2012011221.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 12211020987 and 12211021005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9250114 + ... + 9251433.

It is an arithmetic number, because the mean of its divisors is an integer number (777065016).

Almost surely, 2^12211021020 is an apocalyptic number.

12211021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12211021020 is an abundant number, since it is smaller than the sum of its proper divisors (25088099748).

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

12211021020 is a wasteful number, since it uses less digits than its factorization.

12211021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18501570 (or 18501568 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12211021020 its reverse (2012011221), we get a palindrome (14223032241).

The spelling of 12211021020 in words is "twelve billion, two hundred eleven million, twenty-one thousand, twenty".