121310661 has 8 divisors (see below), whose sum is σ = 162349920. Its totient is φ = 80572592.

The previous prime is 121310647. The next prime is 121310723. The reversal of 121310661 is 166013121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121310661 - 2²¹ = 119213509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121310641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74355 + ... + 75968.

It is an arithmetic number, because the mean of its divisors is an integer number (20293740).

Almost surely, 2^121310661 is an apocalyptic number.

It is an amenable number.

121310661 is a deficient number, since it is larger than the sum of its proper divisors (41039259).

121310661 is a wasteful number, since it uses less digits than its factorization.

121310661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150595.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 121310661 is about 11014.1119024640. Note that the first 3 decimals coincide. The cubic root of 121310661 is about 495.0316763731.

Adding to 121310661 its reverse (166013121), we get a palindrome (287323782).

The spelling of 121310661 in words is "one hundred twenty-one million, three hundred ten thousand, six hundred sixty-one".