12221021020 has 96 divisors (see below), whose sum is σ = 29009135232. Its totient is φ = 4290874368.

The previous prime is 12221020969. The next prime is 12221021053. The reversal of 12221021020 is 2012012221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1028634 + ... + 1040446.

It is an arithmetic number, because the mean of its divisors is an integer number (302178492).

Almost surely, 2^12221021020 is an apocalyptic number.

12221021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12221021020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14504567616).

12221021020 is an abundant number, since it is smaller than the sum of its proper divisors (16788114212).

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

12221021020 is a wasteful number, since it uses less digits than its factorization.

12221021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12031 (or 12029 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12221021020 its reverse (2012012221), we get a palindrome (14233033241).

The spelling of 12221021020 in words is "twelve billion, two hundred twenty-one million, twenty-one thousand, twenty".