12121202221020 has 144 divisors (see below), whose sum is σ = 38040906627360. Its totient is φ = 3120417366528.

The previous prime is 12121202220979. The next prime is 12121202221039. The reversal of 12121202221020 is 2012220212121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12121202220984 and 12121202221002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37354594 + ... + 37677686.

It is an arithmetic number, because the mean of its divisors is an integer number (264172962690).

Almost surely, 2^{12121202221020} is an apocalyptic number.

12121202221020 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 12121202221020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19020453313680).

12121202221020 is an abundant number, since it is smaller than the sum of its proper divisors (25919704406340).

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

12121202221020 is a wasteful number, since it uses less digits than its factorization.

12121202221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330324 (or 330319 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12121202221020 its reverse (2012220212121), we get a palindrome (14133422433141).

The spelling of 12121202221020 in words is "twelve trillion, one hundred twenty-one billion, two hundred two million, two hundred twenty-one thousand, twenty".