121210112011 has 4 divisors (see below), whose sum is σ = 121241493072. Its totient is φ = 121178730952.

The previous prime is 121210111961. The next prime is 121210112027. The reversal of 121210112011 is 110211012121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121210112011 is a prime.

It is a super-4 number, since 4×121210112011⁴ (a number of 45 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121210111982 and 121210112000.

It is not an unprimeable number, because it can be changed into a prime (121210112411) 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, 15684736 + ... + 15692461.

It is an arithmetic number, because the mean of its divisors is an integer number (30310373268).

Almost surely, 2^121210112011 is an apocalyptic number.

121210112011 is a deficient number, since it is larger than the sum of its proper divisors (31381061).

121210112011 is an equidigital number, since it uses as much as digits as its factorization.

121210112011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31381060.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121210112011 its reverse (110211012121), we get a palindrome (231421124132).

The spelling of 121210112011 in words is "one hundred twenty-one billion, two hundred ten million, one hundred twelve thousand, eleven".