12221121020 has 24 divisors (see below), whose sum is σ = 25685390304. Its totient is φ = 4884441536.

The previous prime is 12221121019. The next prime is 12221121037. The reversal of 12221121020 is 2012112221.

It is a junction number, because it is equal to n+sod(n) for n = 12221120986 and 12221121004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225359 + ... + 274278.

It is an arithmetic number, because the mean of its divisors is an integer number (1070224596).

Almost surely, 2^12221121020 is an apocalyptic number.

12221121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221121020 is an abundant number, since it is smaller than the sum of its proper divisors (13464269284).

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

12221121020 is a wasteful number, since it uses less digits than its factorization.

12221121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500869 (or 500867 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12221121020 its reverse (2012112221), we get a palindrome (14233233241).

The spelling of 12221121020 in words is "twelve billion, two hundred twenty-one million, one hundred twenty-one thousand, twenty".