121121210011 has 4 divisors (see below), whose sum is σ = 121169067624. Its totient is φ = 121073352400.

The previous prime is 121121209943. The next prime is 121121210033. The reversal of 121121210011 is 110012121121.

It is a happy number.

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 121121210011 - 2³¹ = 118973726363 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121121209973 and 121121210000.

It is not an unprimeable number, because it can be changed into a prime (121121250011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23925010 + ... + 23930071.

It is an arithmetic number, because the mean of its divisors is an integer number (30292266906).

Almost surely, 2^121121210011 is an apocalyptic number.

121121210011 is a deficient number, since it is larger than the sum of its proper divisors (47857613).

121121210011 is an equidigital number, since it uses as much as digits as its factorization.

121121210011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47857612.

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

Adding to 121121210011 its reverse (110012121121), we get a palindrome (231133331132).

The spelling of 121121210011 in words is "one hundred twenty-one billion, one hundred twenty-one million, two hundred ten thousand, eleven".