121201313220 has 72 divisors (see below), whose sum is σ = 395924297496. Its totient is φ = 29834168832.

The previous prime is 121201313201. The next prime is 121201313239. The reversal of 121201313220 is 22313102121.

121201313220 is a `hidden beast` number, since 1 + 212 + 0 + 131 + 322 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (121201313201) and next prime (121201313239).

It can be written as a sum of positive squares in 4 ways, for example, as 11908920384 + 109292392836 = 109128^2 + 330594^2 .

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 = 121201313193 and 121201313202.

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, 25895377 + ... + 25900056.

Almost surely, 2^121201313220 is an apocalyptic number.

121201313220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121201313220 is an abundant number, since it is smaller than the sum of its proper divisors (274722984276).

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

121201313220 is a wasteful number, since it uses less digits than its factorization.

121201313220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51795461 (or 51795456 counting only the distinct ones).

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

Adding to 121201313220 its reverse (22313102121), we get a palindrome (143514415341).

The spelling of 121201313220 in words is "one hundred twenty-one billion, two hundred one million, three hundred thirteen thousand, two hundred twenty".