121665150 has 72 divisors (see below), whose sum is σ = 338181480. Its totient is φ = 31321920.

The previous prime is 121665149. The next prime is 121665169. The reversal of 121665150 is 51566121.

It is a happy number.

121665150 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 651 + 5 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8389 + ... + 17711.

It is an arithmetic number, because the mean of its divisors is an integer number (4696965).

Almost surely, 2^121665150 is an apocalyptic number.

121665150 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121665150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169090740).

121665150 is an abundant number, since it is smaller than the sum of its proper divisors (216516330).

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

121665150 is a wasteful number, since it uses less digits than its factorization.

121665150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9370 (or 9362 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 121665150 is about 11030.1926547092. The cubic root of 121665150 is about 495.5133944937.

It can be divided in two parts, 1216 and 65150, that added together give a palindrome (66366).

The spelling of 121665150 in words is "one hundred twenty-one million, six hundred sixty-five thousand, one hundred fifty".