121310311020 has 24 divisors (see below), whose sum is σ = 339668871024. Its totient is φ = 32349416256.

The previous prime is 121310311007. The next prime is 121310311021. The reversal of 121310311020 is 20113013121.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (121310311021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1010919199 + ... + 1010919318.

It is an arithmetic number, because the mean of its divisors is an integer number (14152869626).

Almost surely, 2^121310311020 is an apocalyptic number.

121310311020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121310311020 is an abundant number, since it is smaller than the sum of its proper divisors (218358560004).

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

121310311020 is a wasteful number, since it uses less digits than its factorization.

121310311020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2021838529 (or 2021838527 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 121310311020 its reverse (20113013121), we get a palindrome (141423324141).

The spelling of 121310311020 in words is "one hundred twenty-one billion, three hundred ten million, three hundred eleven thousand, twenty".