121012666 has 4 divisors (see below), whose sum is σ = 181519002. Its totient is φ = 60506332.

The previous prime is 121012663. The next prime is 121012693. The reversal of 121012666 is 666210121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666210121 = 941 ⋅707981.

It can be written as a sum of positive squares in only one way, i.e., 105575625 + 15437041 = 10275^2 + 3929^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121012666.

It is not an unprimeable number, because it can be changed into a prime (121012663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30253165 + ... + 30253168.

Almost surely, 2^121012666 is an apocalyptic number.

121012666 is a deficient number, since it is larger than the sum of its proper divisors (60506336).

121012666 is an equidigital number, since it uses as much as digits as its factorization.

121012666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60506335.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 121012666 is about 11000.5757122071. The cubic root of 121012666 is about 494.6260018890.

Adding to 121012666 its reverse (666210121), we get a palindrome (787222787).

The spelling of 121012666 in words is "one hundred twenty-one million, twelve thousand, six hundred sixty-six".