121320310020 has 192 divisors, whose sum is σ = 418659311616. Its totient is φ = 25562304000.

The previous prime is 121320309983. The next prime is 121320310147. The reversal of 121320310020 is 20013023121.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4085667 + ... + 4115253.

It is an arithmetic number, because the mean of its divisors is an integer number (2180517248).

Almost surely, 2^121320310020 is an apocalyptic number.

121320310020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121320310020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209329655808).

121320310020 is an abundant number, since it is smaller than the sum of its proper divisors (297339001596).

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

121320310020 is a wasteful number, since it uses less digits than its factorization.

121320310020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30370 (or 30368 counting only the distinct ones).

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

Adding to 121320310020 its reverse (20013023121), we get a palindrome (141333333141).

The spelling of 121320310020 in words is "one hundred twenty-one billion, three hundred twenty million, three hundred ten thousand, twenty".