121615020 has 120 divisors (see below), whose sum is σ = 391029408. Its totient is φ = 31622400.

The previous prime is 121615001. The next prime is 121615031. The reversal of 121615020 is 20516121.

121615020 is a `hidden beast` number, since 1 + 2 + 161 + 502 + 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 = 121614984 and 121615002.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 65505 + ... + 67335.

Almost surely, 2^121615020 is an apocalyptic number.

121615020 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 121615020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195514704).

121615020 is an abundant number, since it is smaller than the sum of its proper divisors (269414388).

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

121615020 is a wasteful number, since it uses less digits than its factorization.

121615020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893 (or 1882 counting only the distinct ones).

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

The square root of 121615020 is about 11027.9200214728. The cubic root of 121615020 is about 495.4453292647.

The spelling of 121615020 in words is "one hundred twenty-one million, six hundred fifteen thousand, twenty".