121211111005 has 8 divisors (see below), whose sum is σ = 145459661400. Its totient is φ = 96964670016.

The previous prime is 121211110903. The next prime is 121211111017. The reversal of 121211111005 is 500111112121.

It can be written as a sum of positive squares in 4 ways, for example, as 54103690404 + 67107420601 = 232602^2 + 259051^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121211111005 - 2¹⁷ = 121210979933 is a prime.

It is a super-2 number, since 2×121211111005² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121211111005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398050 + ... + 633139.

It is an arithmetic number, because the mean of its divisors is an integer number (18182457675).

Almost surely, 2^121211111005 is an apocalyptic number.

It is an amenable number.

121211111005 is a deficient number, since it is larger than the sum of its proper divisors (24248550395).

121211111005 is a wasteful number, since it uses less digits than its factorization.

121211111005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054703.

The product of its (nonzero) digits is 20, while the sum is 16.

Adding to 121211111005 its reverse (500111112121), we get a palindrome (621322223126).

The spelling of 121211111005 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, five".