121505424211 has 4 divisors (see below), whose sum is σ = 121513160952. Its totient is φ = 121497687472.

The previous prime is 121505424199. The next prime is 121505424269. The reversal of 121505424211 is 112424505121.

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 121505424211 - 2¹¹ = 121505422163 is a prime.

It is a super-2 number, since 2×121505424211² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121505424211.

It is not an unprimeable number, because it can be changed into a prime (121505424311) 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, 3844765 + ... + 3876238.

It is an arithmetic number, because the mean of its divisors is an integer number (30378290238).

Almost surely, 2^121505424211 is an apocalyptic number.

121505424211 is a deficient number, since it is larger than the sum of its proper divisors (7736741).

121505424211 is an equidigital number, since it uses as much as digits as its factorization.

121505424211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7736740.

The product of its (nonzero) digits is 3200, while the sum is 28.

Adding to 121505424211 its reverse (112424505121), we get a palindrome (233929929332).

The spelling of 121505424211 in words is "one hundred twenty-one billion, five hundred five million, four hundred twenty-four thousand, two hundred eleven".