121273020 has 144 divisors (see below), whose sum is σ = 418908672. Its totient is φ = 28110720.

The previous prime is 121273007. The next prime is 121273021. The reversal of 121273020 is 20372121.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121272984 and 121273002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121273021) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 44209 + ... + 46871.

It is an arithmetic number, because the mean of its divisors is an integer number (2909088).

Almost surely, 2^121273020 is an apocalyptic number.

121273020 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 121273020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209454336).

121273020 is an abundant number, since it is smaller than the sum of its proper divisors (297635652).

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

121273020 is a wasteful number, since it uses less digits than its factorization.

121273020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2712 (or 2707 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 121273020 is about 11012.4030075184. The cubic root of 121273020 is about 494.9804706100.

The spelling of 121273020 in words is "one hundred twenty-one million, two hundred seventy-three thousand, twenty".