30121021020 has 96 divisors (see below), whose sum is σ = 86296170240. Its totient is φ = 7847539200.

The previous prime is 30121021019. The next prime is 30121021037. The reversal of 30121021020 is 2012012103.

It is a super-4 number, since 4×30121021020⁴ (a number of 43 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 30121020987 and 30121021005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 550920 + ... + 603120.

It is an arithmetic number, because the mean of its divisors is an integer number (898918440).

Almost surely, 2^30121021020 is an apocalyptic number.

30121021020 is a gapful number since it is divisible by the number (30) 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 30121021020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43148085120).

30121021020 is an abundant number, since it is smaller than the sum of its proper divisors (56175149220).

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

30121021020 is a wasteful number, since it uses less digits than its factorization.

30121021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52435 (or 52433 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 30121021020 its reverse (2012012103), we get a palindrome (32133033123).

The spelling of 30121021020 in words is "thirty billion, one hundred twenty-one million, twenty-one thousand, twenty".