121545020 has 24 divisors (see below), whose sum is σ = 256078368. Its totient is φ = 48459200.

The previous prime is 121545013. The next prime is 121545029. The reversal of 121545020 is 20545121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 121544983 and 121545001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121545029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3551 + ... + 15990.

It is an arithmetic number, because the mean of its divisors is an integer number (10669932).

Almost surely, 2^121545020 is an apocalyptic number.

121545020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121545020 is an abundant number, since it is smaller than the sum of its proper divisors (134533348).

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

121545020 is a wasteful number, since it uses less digits than its factorization.

121545020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19861 (or 19859 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 121545020 is about 11024.7458020582. The cubic root of 121545020 is about 495.3502537573.

The spelling of 121545020 in words is "one hundred twenty-one million, five hundred forty-five thousand, twenty".