121031233220 has 24 divisors (see below), whose sum is σ = 255083166744. Its totient is φ = 48237716736.

The previous prime is 121031233159. The next prime is 121031233237. The reversal of 121031233220 is 22332130121.

It can be written as a sum of positive squares in 4 ways, for example, as 3641398336 + 117389834884 = 60344^2 + 342622^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 121031233192 and 121031233201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10917857 + ... + 10928936.

It is an arithmetic number, because the mean of its divisors is an integer number (10628465281).

Almost surely, 2^121031233220 is an apocalyptic number.

121031233220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121031233220 is an abundant number, since it is smaller than the sum of its proper divisors (134051933524).

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

121031233220 is a wasteful number, since it uses less digits than its factorization.

121031233220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21847079 (or 21847077 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 121031233220 its reverse (22332130121), we get a palindrome (143363363341).

The spelling of 121031233220 in words is "one hundred twenty-one billion, thirty-one million, two hundred thirty-three thousand, two hundred twenty".