121220223020 has 96 divisors (see below), whose sum is σ = 278628504000. Its totient is φ = 44028002304.

The previous prime is 121220222993. The next prime is 121220223029. The reversal of 121220223020 is 20322022121.

It is a self number, because there is not a number n which added to its sum of digits gives 121220223020.

It is not an unprimeable number, because it can be changed into a prime (121220223029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13391456 + ... + 13400504.

It is an arithmetic number, because the mean of its divisors is an integer number (2902380250).

Almost surely, 2^121220223020 is an apocalyptic number.

121220223020 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 121220223020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139314252000).

121220223020 is an abundant number, since it is smaller than the sum of its proper divisors (157408280980).

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

121220223020 is a wasteful number, since it uses less digits than its factorization.

121220223020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9907 (or 9905 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 121220223020 its reverse (20322022121), we get a palindrome (141542245141).

The spelling of 121220223020 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred twenty-three thousand, twenty".