121221011 has 4 divisors (see below), whose sum is σ = 121244592. Its totient is φ = 121197432.

The previous prime is 121220993. The next prime is 121221013. The reversal of 121221011 is 110122121.

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

It is a cyclic number.

It is not a de Polignac number, because 121221011 - 2¹⁴ = 121204627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121220983 and 121221001.

It is not an unprimeable number, because it can be changed into a prime (121221013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431 + ... + 15576.

It is an arithmetic number, because the mean of its divisors is an integer number (30311148).

Almost surely, 2^121221011 is an apocalyptic number.

121221011 is a deficient number, since it is larger than the sum of its proper divisors (23581).

121221011 is an equidigital number, since it uses as much as digits as its factorization.

121221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23580.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 121221011 is about 11010.0413714027. The cubic root of 121221011 is about 494.9097015847.

Adding to 121221011 its reverse (110122121), we get a palindrome (231343132).

The spelling of 121221011 in words is "one hundred twenty-one million, two hundred twenty-one thousand, eleven".