121781330 has 64 divisors (see below), whose sum is σ = 250822656. Its totient is φ = 42168000.

The previous prime is 121781327. The next prime is 121781339. The reversal of 121781330 is 33187121.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121781330.

It is not an unprimeable number, because it can be changed into a prime (121781339) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 241859 + ... + 242361.

It is an arithmetic number, because the mean of its divisors is an integer number (3919104).

Almost surely, 2^121781330 is an apocalyptic number.

121781330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121781330 is an abundant number, since it is smaller than the sum of its proper divisors (129041326).

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

121781330 is a wasteful number, since it uses less digits than its factorization.

121781330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 121781330 is about 11035.4578518519. The cubic root of 121781330 is about 495.6710688741.

The spelling of 121781330 in words is "one hundred twenty-one million, seven hundred eighty-one thousand, three hundred thirty".