122121211 has 4 divisors (see below), whose sum is σ = 122194872. Its totient is φ = 122047552.

The previous prime is 122121203. The next prime is 122121239. The reversal of 122121211 is 112121221.

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 122121211 - 2³ = 122121203 is a prime.

It is a super-2 number, since 2×122121211² = 29827180352213042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122121191 and 122121200.

It is not an unprimeable number, because it can be changed into a prime (122128211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34285 + ... + 37678.

It is an arithmetic number, because the mean of its divisors is an integer number (30548718).

Almost surely, 2^122121211 is an apocalyptic number.

122121211 is a deficient number, since it is larger than the sum of its proper divisors (73661).

122121211 is an equidigital number, since it uses as much as digits as its factorization.

122121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73660.

The product of its digits is 16, while the sum is 13.

The square root of 122121211 is about 11050.8466191510. The cubic root of 122121211 is about 496.1317653634.

Adding to 122121211 its reverse (112121221), we get a palindrome (234242432).

The spelling of 122121211 in words is "one hundred twenty-two million, one hundred twenty-one thousand, two hundred eleven".