121309650 has 240 divisors, whose sum is σ = 421312320. Its totient is φ = 25142400.

The previous prime is 121309619. The next prime is 121309651. The reversal of 121309650 is 56903121.

121309650 is a `hidden beast` number, since 1 + 2 + 1 + 3 + 0 + 9 + 650 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121309651) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 311656 + ... + 312044.

It is an arithmetic number, because the mean of its divisors is an integer number (1755468).

Almost surely, 2^121309650 is an apocalyptic number.

121309650 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 121309650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210656160).

121309650 is an abundant number, since it is smaller than the sum of its proper divisors (300002670).

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

121309650 is a wasteful number, since it uses less digits than its factorization.

121309650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431 (or 417 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 121309650 is about 11014.0660067025. The cubic root of 121309650 is about 495.0303011754.

The spelling of 121309650 in words is "one hundred twenty-one million, three hundred nine thousand, six hundred fifty".