121311231020 has 48 divisors (see below), whose sum is σ = 291167139648. Its totient is φ = 41589538560.

The previous prime is 121311230947. The next prime is 121311231023. The reversal of 121311231020 is 20132113121.

It is a self number, because there is not a number n which added to its sum of digits gives 121311231020.

It is not an unprimeable number, because it can be changed into a prime (121311231023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3350534 + ... + 3386546.

It is an arithmetic number, because the mean of its divisors is an integer number (6065982076).

Almost surely, 2^121311231020 is an apocalyptic number.

121311231020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121311231020 is an abundant number, since it is smaller than the sum of its proper divisors (169855908628).

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

121311231020 is a wasteful number, since it uses less digits than its factorization.

121311231020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60090 (or 60088 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 121311231020 its reverse (20132113121), we get a palindrome (141443344141).

The spelling of 121311231020 in words is "one hundred twenty-one billion, three hundred eleven million, two hundred thirty-one thousand, twenty".