121300020 has 72 divisors (see below), whose sum is σ = 369290376. Its totient is φ = 32228352.

The previous prime is 121300019. The next prime is 121300027. The reversal of 121300020 is 20003121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9659664 + 111640356 = 3108^2 + 10566^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 121299975 and 121300011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121300027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55264 + ... + 57416.

It is an arithmetic number, because the mean of its divisors is an integer number (5129033).

Almost surely, 2^121300020 is an apocalyptic number.

121300020 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 121300020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184645188).

121300020 is an abundant number, since it is smaller than the sum of its proper divisors (247990356).

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

121300020 is a wasteful number, since it uses less digits than its factorization.

121300020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2481 (or 2476 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 121300020 is about 11013.6288297727. The cubic root of 121300020 is about 495.0172017285.

Adding to 121300020 its reverse (20003121), we get a palindrome (141303141).

The spelling of 121300020 in words is "one hundred twenty-one million, three hundred thousand, twenty".