121211711207 has 4 divisors (see below), whose sum is σ = 123498724680. Its totient is φ = 118924697736.

The previous prime is 121211711167. The next prime is 121211711209. The reversal of 121211711207 is 702117112121.

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 121211711207 - 2⁶ = 121211711143 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 (121211711209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1143506657 + ... + 1143506762.

It is an arithmetic number, because the mean of its divisors is an integer number (30874681170).

Almost surely, 2^121211711207 is an apocalyptic number.

121211711207 is a deficient number, since it is larger than the sum of its proper divisors (2287013473).

121211711207 is an equidigital number, since it uses as much as digits as its factorization.

121211711207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2287013472.

The product of its (nonzero) digits is 392, while the sum is 26.

Adding to 121211711207 its reverse (702117112121), we get a palindrome (823328823328).

The spelling of 121211711207 in words is "one hundred twenty-one billion, two hundred eleven million, seven hundred eleven thousand, two hundred seven".