121819664 has 10 divisors (see below), whose sum is σ = 236025630. Its totient is φ = 60909824.

The previous prime is 121819657. The next prime is 121819667. The reversal of 121819664 is 466918121.

It can be written as a sum of positive squares in only one way, i.e., 72931600 + 48888064 = 8540^2 + 6992^2 .

It is not an unprimeable number, because it can be changed into a prime (121819667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3806849 + ... + 3806880.

It is an arithmetic number, because the mean of its divisors is an integer number (23602563).

Almost surely, 2^121819664 is an apocalyptic number.

It is an amenable number.

121819664 is a deficient number, since it is larger than the sum of its proper divisors (114205966).

121819664 is an equidigital number, since it uses as much as digits as its factorization.

121819664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7613737 (or 7613731 counting only the distinct ones).

The product of its digits is 20736, while the sum is 38.

The square root of 121819664 is about 11037.1945710855. The cubic root of 121819664 is about 495.7230720873.

The spelling of 121819664 in words is "one hundred twenty-one million, eight hundred nineteen thousand, six hundred sixty-four".