121560020 has 24 divisors (see below), whose sum is σ = 255633504. Its totient is φ = 48555936.

The previous prime is 121559993. The next prime is 121560071. The reversal of 121560020 is 20065121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11879 + ... + 19601.

It is an arithmetic number, because the mean of its divisors is an integer number (10651396).

Almost surely, 2^121560020 is an apocalyptic number.

121560020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121560020 is an abundant number, since it is smaller than the sum of its proper divisors (134073484).

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

121560020 is a wasteful number, since it uses less digits than its factorization.

121560020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8519 (or 8517 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 121560020 is about 11025.4260688646. The cubic root of 121560020 is about 495.3706301527.

The spelling of 121560020 in words is "one hundred twenty-one million, five hundred sixty thousand, twenty".