121204661 has 4 divisors (see below), whose sum is σ = 121236012. Its totient is φ = 121173312.

The previous prime is 121204649. The next prime is 121204663. The reversal of 121204661 is 166402121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4024036 + 117180625 = 2006^2 + 10825^2 .

It is a cyclic number.

It is not a de Polignac number, because 121204661 - 2¹⁰ = 121203637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121204663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8900 + ... + 17933.

It is an arithmetic number, because the mean of its divisors is an integer number (30309003).

Almost surely, 2^121204661 is an apocalyptic number.

It is an amenable number.

121204661 is a deficient number, since it is larger than the sum of its proper divisors (31351).

121204661 is an equidigital number, since it uses as much as digits as its factorization.

121204661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31350.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 121204661 is about 11009.2988423423. The cubic root of 121204661 is about 494.8874498386.

Adding to 121204661 its reverse (166402121), we get a palindrome (287606782).

The spelling of 121204661 in words is "one hundred twenty-one million, two hundred four thousand, six hundred sixty-one".