121660401 has 16 divisors (see below), whose sum is σ = 171325440. Its totient is φ = 76579920.

The previous prime is 121660397. The next prime is 121660411. The reversal of 121660401 is 104066121.

It is not a de Polignac number, because 121660401 - 2² = 121660397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121660411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14296 + ... + 21158.

It is an arithmetic number, because the mean of its divisors is an integer number (10707840).

Almost surely, 2^121660401 is an apocalyptic number.

It is an amenable number.

121660401 is a deficient number, since it is larger than the sum of its proper divisors (49665039).

121660401 is a wasteful number, since it uses less digits than its factorization.

121660401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7196.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 121660401 is about 11029.9773798499. The cubic root of 121660401 is about 495.5069472250.

The spelling of 121660401 in words is "one hundred twenty-one million, six hundred sixty thousand, four hundred one".