121020550 has 24 divisors (see below), whose sum is σ = 257255856. Its totient is φ = 41492640.

The previous prime is 121020547. The next prime is 121020553. The reversal of 121020550 is 55020121.

It is an interprime number because it is at equal distance from previous prime (121020547) and next prime (121020553).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121020553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 172537 + ... + 173236.

It is an arithmetic number, because the mean of its divisors is an integer number (10718994).

Almost surely, 2^121020550 is an apocalyptic number.

121020550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121020550 is an abundant number, since it is smaller than the sum of its proper divisors (136235306).

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

121020550 is a wasteful number, since it uses less digits than its factorization.

121020550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345792 (or 345787 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 121020550 is about 11000.9340512522. The cubic root of 121020550 is about 494.6367433175.

Adding to 121020550 its reverse (55020121), we get a palindrome (176040671).

The spelling of 121020550 in words is "one hundred twenty-one million, twenty thousand, five hundred fifty".