121305020 has 24 divisors (see below), whose sum is σ = 255691968. Its totient is φ = 48340800.

The previous prime is 121305001. The next prime is 121305029. The reversal of 121305020 is 20503121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121304986 and 121305004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121305029) 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 7 ways as a sum of consecutive naturals, for example, 5771 + ... + 16610.

It is an arithmetic number, because the mean of its divisors is an integer number (10653832).

Almost surely, 2^121305020 is an apocalyptic number.

121305020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121305020 is an abundant number, since it is smaller than the sum of its proper divisors (134386948).

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

121305020 is a wasteful number, since it uses less digits than its factorization.

121305020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22661 (or 22659 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 121305020 is about 11013.8558189219. The cubic root of 121305020 is about 495.0240031893.

Adding to 121305020 its reverse (20503121), we get a palindrome (141808141).

The spelling of 121305020 in words is "one hundred twenty-one million, three hundred five thousand, twenty".