121165020 has 72 divisors (see below), whose sum is σ = 369663840. Its totient is φ = 32123520.

The previous prime is 121165007. The next prime is 121165021. The reversal of 121165020 is 20561121.

121165020 is a `hidden beast` number, since 1 + 2 + 11 + 650 + 2 + 0 = 666.

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 = 121164984 and 121165002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121165021) 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, 30721 + ... + 34439.

It is an arithmetic number, because the mean of its divisors is an integer number (5134220).

Almost surely, 2^121165020 is an apocalyptic number.

121165020 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 121165020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184831920).

121165020 is an abundant number, since it is smaller than the sum of its proper divisors (248498820).

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

121165020 is a wasteful number, since it uses less digits than its factorization.

121165020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3915 (or 3910 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 121165020 is about 11007.4983533953. The cubic root of 121165020 is about 494.8334915933.

The spelling of 121165020 in words is "one hundred twenty-one million, one hundred sixty-five thousand, twenty".