121817730 has 16 divisors (see below), whose sum is σ = 292362624. Its totient is φ = 32484720.

The previous prime is 121817701. The next prime is 121817737. The reversal of 121817730 is 37718121.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 4060591 = 121817730 / (1 + 2 + 1 + 8 + 1 + 7 + 7 + 3 + 0).

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (121817737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2030266 + ... + 2030325.

It is an arithmetic number, because the mean of its divisors is an integer number (18272664).

Almost surely, 2^121817730 is an apocalyptic number.

121817730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121817730 is an abundant number, since it is smaller than the sum of its proper divisors (170544894).

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

121817730 is a wasteful number, since it uses less digits than its factorization.

121817730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4060601.

The product of its (nonzero) digits is 2352, while the sum is 30.

The square root of 121817730 is about 11037.1069578944. The cubic root of 121817730 is about 495.7204487191.

The spelling of 121817730 in words is "one hundred twenty-one million, eight hundred seventeen thousand, seven hundred thirty".