331000121220 has 24 divisors (see below), whose sum is σ = 926800339584. Its totient is φ = 88266698976.

The previous prime is 331000121213. The next prime is 331000121227. The reversal of 331000121220 is 22121000133.

It is an interprime number because it is at equal distance from previous prime (331000121213) and next prime (331000121227).

It is a super-2 number, since 2×331000121220² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 331000121220.

It is not an unprimeable number, because it can be changed into a prime (331000121227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2758334284 + ... + 2758334403.

It is an arithmetic number, because the mean of its divisors is an integer number (38616680816).

Almost surely, 2^331000121220 is an apocalyptic number.

331000121220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

331000121220 is an abundant number, since it is smaller than the sum of its proper divisors (595800218364).

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

331000121220 is a wasteful number, since it uses less digits than its factorization.

331000121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5516668699 (or 5516668697 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 331000121220 its reverse (22121000133), we get a palindrome (353121121353).

The spelling of 331000121220 in words is "three hundred thirty-one billion, one hundred twenty-one thousand, two hundred twenty".