121001022220 has 72 divisors (see below), whose sum is σ = 276133384800. Its totient is φ = 44517957120.

The previous prime is 121001022217. The next prime is 121001022257. The reversal of 121001022220 is 22220100121.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 121001022220.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 886081 + ... + 1013479.

It is an arithmetic number, because the mean of its divisors is an integer number (3835185900).

Almost surely, 2^121001022220 is an apocalyptic number.

121001022220 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 121001022220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138066692400).

121001022220 is an abundant number, since it is smaller than the sum of its proper divisors (155132362580).

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

121001022220 is a wasteful number, since it uses less digits than its factorization.

121001022220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127715 (or 127700 counting only the distinct ones).

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

Adding to 121001022220 its reverse (22220100121), we get a palindrome (143221122341).

The spelling of 121001022220 in words is "one hundred twenty-one billion, one million, twenty-two thousand, two hundred twenty".