30121320020 has 96 divisors (see below), whose sum is σ = 69453054720. Its totient is φ = 10882396160.

The previous prime is 30121320017. The next prime is 30121320023. The reversal of 30121320020 is 2002312103.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (30121320017) and next prime (30121320023).

It is a junction number, because it is equal to n+sod(n) for n = 30121319977 and 30121320004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30121320023) 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 31 ways as a sum of consecutive naturals, for example, 32422916 + ... + 32423844.

It is an arithmetic number, because the mean of its divisors is an integer number (723469320).

Almost surely, 2^30121320020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30121320020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34726527360).

30121320020 is an abundant number, since it is smaller than the sum of its proper divisors (39331734700).

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

30121320020 is a wasteful number, since it uses less digits than its factorization.

30121320020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1745 (or 1743 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 30121320020 its reverse (2002312103), we get a palindrome (32123632123).

The spelling of 30121320020 in words is "thirty billion, one hundred twenty-one million, three hundred twenty thousand, twenty".