121238816 has 12 divisors (see below), whose sum is σ = 238688982. Its totient is φ = 60619392.

The previous prime is 121238813. The next prime is 121238833. The reversal of 121238816 is 618832121.

It can be written as a sum of positive squares in only one way, i.e., 103632400 + 17606416 = 10180^2 + 4196^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 3788713 = 121238816 / (1 + 2 + 1 + 2 + 3 + 8 + 8 + 1 + 6).

It is not an unprimeable number, because it can be changed into a prime (121238813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1894325 + ... + 1894388.

Almost surely, 2^121238816 is an apocalyptic number.

121238816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121238816 is a deficient number, since it is larger than the sum of its proper divisors (117450166).

121238816 is an equidigital number, since it uses as much as digits as its factorization.

121238816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3788723 (or 3788715 counting only the distinct ones).

The product of its digits is 4608, while the sum is 32.

The square root of 121238816 is about 11010.8499217817. The cubic root of 121238816 is about 494.9339312562.

The spelling of 121238816 in words is "one hundred twenty-one million, two hundred thirty-eight thousand, eight hundred sixteen".