121221122011 has 4 divisors (see below), whose sum is σ = 132241224024. Its totient is φ = 110201020000.

The previous prime is 121221121997. The next prime is 121221122021. The reversal of 121221122011 is 110221122121.

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 121221122011 - 2²³ = 121212733403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221122021) 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, 5510050990 + ... + 5510051011.

It is an arithmetic number, because the mean of its divisors is an integer number (33060306006).

Almost surely, 2^121221122011 is an apocalyptic number.

121221122011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121221122011 is a deficient number, since it is larger than the sum of its proper divisors (11020102013).

121221122011 is a wasteful number, since it uses less digits than its factorization.

121221122011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11020102012.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121221122011 its reverse (110221122121), we get a palindrome (231442244132).

The spelling of 121221122011 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-two thousand, eleven".