121031321220 has 72 divisors (see below), whose sum is σ = 373146872280. Its totient is φ = 31745917440.

The previous prime is 121031321219. The next prime is 121031321231. The reversal of 121031321220 is 22123130121.

121031321220 is a `hidden beast` number, since 121 + 0 + 3 + 1 + 321 + 220 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 8956351044 + 112074970176 = 94638^2 + 334776^2 .

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 = 121031321193 and 121031321202.

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, 5500465 + ... + 5522424.

Almost surely, 2^121031321220 is an apocalyptic number.

121031321220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121031321220 is an abundant number, since it is smaller than the sum of its proper divisors (252115551060).

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

121031321220 is a wasteful number, since it uses less digits than its factorization.

121031321220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11022965 (or 11022960 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 121031321220 its reverse (22123130121), we get a palindrome (143154451341).

The spelling of 121031321220 in words is "one hundred twenty-one billion, thirty-one million, three hundred twenty-one thousand, two hundred twenty".