121330021020 has 384 divisors, whose sum is σ = 409067366400. Its totient is φ = 26544734208.

The previous prime is 121330021019. The next prime is 121330021067. The reversal of 121330021020 is 20120033121.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 110601112 + ... + 110602208.

It is an arithmetic number, because the mean of its divisors is an integer number (1065279600).

Almost surely, 2^121330021020 is an apocalyptic number.

121330021020 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 121330021020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204533683200).

121330021020 is an abundant number, since it is smaller than the sum of its proper divisors (287737345380).

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

121330021020 is a wasteful number, since it uses less digits than its factorization.

121330021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597 (or 1595 counting only the distinct ones).

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

Adding to 121330021020 its reverse (20120033121), we get a palindrome (141450054141).

The spelling of 121330021020 in words is "one hundred twenty-one billion, three hundred thirty million, twenty-one thousand, twenty".